Field notes, 1964

ID: SIA RU007318

Creator: Cooper, G. Arthur (Gustav Arthur) 1902-

Form/Genre: Fieldbook record

Date: 1964

Citation: G. Arthur Cooper Papers, 1923-1993 and undated

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Abstract

This field book contains paleontological and geological field notes taken in New Mexico to Texas from 15 March to 25 April 1964. Cooper describes stratigraphy of each location visited and notes the fossils found at each level. He also includes descriptions of the shale. Brachiopoda and other fossil specimens are noted. Also includes index of localities. Locations include Derry, Alamo Canyon, Caballos Mountains, Cooks Peak, Hermosa, Red House Mountain, and other locations. Page numbers 01-53.

Date Range

1964

Start Date

Mar 15, 1964

End Date

Apr 25, 1964

Access Information

Many of SIA's holdings are located off-site, and advance notice is recommended to consult a collection. Please email the SIA Reference Team at osiaref@si.edu.

Topic

  • Geology
  • Paleontology

Place

  • Caballo Mountains
  • United States
  • New Mexico
  • Derry
  • Hermosa
  • Alamo Canyon
  • Texas
  • Red House Mountain
  • Cooks Peak

Form/Genre

  • Fieldbook record
  • Field notes

Accession #

SIA RU007318

Collection name

G. Arthur Cooper Papers, 1923-1993 and undated

Physical Description

1 field book

Physical Location

Smithsonian Institution Archives

Sublocation

Box 34 Folder 5

New Mexico & Texas Cooper - Dutro Mar. 15 - Apr. 25, 1964 Alamo Canyon 48 [[check mark]] Bear Canyon 43 Bear Mountain 1 Caballos Mtns. - South end 32 Chise 25 Cooks Peak 29 [[check mark]] Deadman Canyon (Saint [[?]]) 40 Derry Hills 19 Escondido Canyon 34 Georgetown 5 [[check mark]] Hembrillo Canyon 38 Hermosa 22 Hillsboro [[image: square]] 9 Kingston 11 Lone Mountain 8 Mud Springs Mountains 15 Mule Canyon 45 Nackaye Mine 20 Paint Mine 31 Palmer Park 32 Percha Type section 14 Red House Mountain 26 [[check mark]] Sly Gap 36, 46
[[circled]] 1 [[/circled]] March 21 Bear Mtn. - North end SE 1/4 SW 1/4 11 - 17S - 15W. E. - main mass of box bluish irregularly bedded nodular shale D. - One foot hard resistant layer, making a ledge C. Four feet irregularly bedded hard shale like Percha above with corals, Uchtoopinfer[[?]] Paurorhyncha B - 10' of dark gray shale with lines of hard limey nodules about a few inches to 6" apart. Nodules very irregular with a few fossils Rhynchonellids (small) and crinoid stems on surface. Nodules weather yellow. Nodules very hard, fine grained, smooth fracture. One nodule had many Syringopora, another Paurorhyncha. 20 - 30' below base of B comes more nodules, much larger but more scattered. These contain Syringospira commonly and occasional Lioproductus. I guess 10' - 15' of shale with these nodules. Also saw Paurorhyncha and other Box fossils. [[sketch in margin]] E ------------| D | 1' ------------| C | 4' ------------| B 10' | ------------| A Ready Pay | 20 - 30' | ------------| 10' - 15' | big nodules | ------------| [[/sketch]]
[[circled]] 2 [[/circled]] In the locality on W side Bear Mtn. the productids were most abundant at the very base of the Box. Roll A (color) some personal, one of Nellie Bly on Tulsa Freeway; several views of westside Bear Mtn. also views of concretions at top of Ready Pay. March 22 Bear Mtn. Take Alabama Ave N for Bear Mtn. N70° W 23° N on upper surface of Fusselman at (F). Slope < 17° 275' to base of large nodules. (15' of large nodules) = 275-290' 290'to 325' to base of small nodules 325-345' of thin nodular layer. 345'-346' hard band = base of Box. 346-458 to base Mississippian Basal Miss. has a thin cgl. zone It is hard granular lo[[?]] in contrast to the shaly silty Percha. Lower 5' to perhaps 10' is finer silty shale breaking into lumps and pieces up to an inch thick. It is crumbly blue gray in color, not fissile and black. Only fossils seen are plant. [[Sketch of geologic column in margin]] Miss ------------| |[[vertical two-headed arrow]] 112' | ------------| | 1' ------------| Thin nodule | layer inch | 20' apart | ------------| | ------------| 50 ' hor. [[vertical arrow from base of 15' large | unit to top of unit above]] nodules | ------------| Black sh. | [[vertical note next to Black shale | unit]] 275' hor. | ------------| F | Fusselman || [[/sketch]]
[[circled left margin]]3[[/circled left margin]] Contact 0.2 mile upstream from road at bend of road where creek crosses as we come from E a good section of Box is exposed, with lower hard band well exhibited. Schizophoria common above and below. Syringospira best developed in lower nodules. Hard bands of 1' occur 15' below Miss. contact and 6' below that one. [[sketch in left margin]] Miss | -----| 15 | =====| 6' | =====| | [[/end of sketch]] Section above lower hard band 0-4 HL steps set at 22° A. hard band B. Crumbly nodule shale producing cobbles of less than an inch to 3" but mostly small C. harder beds, some standing out in relief D - 4HL - hard nodular beds, fairly compact, holding up a steep part of bank. E - One foot hard blue ls weathering pink and forming a conspicuous ledge. F - 4 1/2 HL same as D. Strike & dip on overlying Miss N 35° W 21° N [[sketch in left margin]] ---------| 4 1/2 HL | ---------| 1' | E ---------| 4HL | D ---------| 2HL | C ---------| 4HL | B ---------| | A ---------| [[end of sketch]]
[[circled]] 4 [[/circled]] The collecting places in Bear Mountain region are mainly in the SE 1/4 13 - 17S - 15W but some collecting can be had in the adjacent SW 1/4 18 - 17S - 14W. The black shale contact with the Fusselman appears 0.2 mile up the arroyo in the SE corner of Sec. 13 but the relationships are complicated by igneous intrusions This is true also of contact to the NW and especially on the west side of Bear Mtn. The shale in the lower 5' at least of the Ready Pay is silty and somewhat blocky. We saw a few plants but no other fossils. From the base to the first modules to appear the shale is flaky and dark gray. The first nodules are dirty brown weathering and fossiliferous The nodules are large, 6" to a foot across, one to several inches thick. [[underlined]] Syringospira [[/underlined]] is the commonest fossil in them. A gap appears between the lower large nodules and the next bed of them. The second nodular is of small nodules, perhaps 10' and passes into less fissile, solider shale also with nodules. About 5' of this more solid shale
[[encircled]] 5 [[/encircled]] underlies a one-foot hard bed. Above this bed comes some 100' of modular limy Box member with fossils. Productids are commonest in the 20 feet above the lower hard bed. [[underline]]Syringospira[[/underline]] occurs here also but is uncommon. Fossils are larger generally but less common in the upper Box. Several hard bands that stand out slopes also appear above the lowest hard bed. March 23 Georgetown M23 - about 0.1 mile on road contact of Fusselman and black shale. Top of Fussel, with black skin of Hematite shale not fissile but more solid. About 30' above contact comes brown ss lenses with worm burrows and other markings. These range from 1/2" to 3" thick; irregular, discontinuous no definite fossils seen. Handlevelled center slope 0-62' characteristic nodular bluish Box to hard band 1' - hard band {11' crumbly modular shale grayer than below F { {18' Covered to base of Miss Below 0 is about 15 of crumbly nodular rock [[sketch of geologic column in left margin]] -------| 29' | F | -------| 1' | E -------| | | 67' | D | | -------| 5' | C -------| 10' | B | -------| | A | [[end of sketch]]
6 B - I guess at 10' sparsely nodular, brown weathering nodules in soft dark shale. After this is the shale is without nodules. On the north bank of the creek cutting the hair pin at Georgetown About on section line just S of NW cor 7, are 2 feet of silty and sandy light brown weathering rock lying just on the Fusselman. A little to the west in the north bank are 5' of sandy, silty shale with some sandstone lenses like those of M23[[superscript]] 1 [[/superscript]]. On the road the rock is the usual flaky Ready Pay. At Georgetown the box seems unusually solid and very blue, in marked contrast to that at 3.2 miles east of Santa Rita. Came from Georgetown down Willow Springs Canyon which exposes good section of Fusselman. Went to locality east of Santa Rita Road changes and a possible different point of measure in Santa Rita lops a mile off my measure. This should read 3.3 miles east of Santa Rita not 4 miles. Most of the collecting here is in the lower noduler of Box
[[circled]] 7 [[/circled]] This section seems more shaly than the Georgetown section, more gray and less blue. It abounds in composite which is rarer elsewhere. BW - 0 - 16 - Bear Mtn, Georgetown, nodules on road east of Santa Rita C - 0 - 19 - Same as above - views of Santa Rita pit, Santa Rita - views of Georgetown (scenic) and out crop 1/2 mile NE of Georgetown. March 24 Lone Mtn. See next page
[[circled]] 8 [[/circled]] March 24 Lone Mountain M24[[superscript]] 1 [[/superscript]] color - 26 - contact Fuss & Ready pay - 21 - contact Fuss & Ready pay [[circled]] M24 [[/circled]] Spare sample 300' NW of M24' at a contact. M24[[superscript]] 1 [[/superscript]] - Contact with Fusselman patches of sandstone up 2" thick occupying cavities in Fusselman overlain by up to 15' dark gray shale much of it breaking in lumps. Shale quite silty. Pyrite nodules of various shapes in lower 5'. In the entire valley we were unable to find any Box well expressed. The exposed surfaces of Fusselman were very good especially that at M24[[superscript]] 1 [[/superscript]], the best by far of any seen anywhere. The lowest 15' of Ready Pay is definitely different shale from the higher flaky material. We saw nothing however that could be construed to be Oñate.
[[circled]] 9 [[/circled]] March 25 {28 - Silver City - Broadway C1 {29 - Old Mine Junction US 180 & NM90. {30 - to end of roll Santa Rita & Kneeling Nun. C2 1-3 View from top Black Range Mar 25' Mar 25' SW¼ SE¼ SE¼ 9-18S-7W, Hillsboro ☐ A - one foot yellowish gray shale silty, crumbly. No fossils B - White-streaking dark gray, almost black, crumbly shale (not flaky) Silty. C - Brown sandstone with fish fragments and conodonts 1 to 2⊓ at this place, thicker in road. D - Pink-weathering ^[[sandy]] dolomite, irregular, with worm-markings and occasional conodonts 4" E - Fissile, paper think, brown streaking shale 1½' F brown sand, quartz, fine, abounding in conodonts g - Main mass of Ready Pay like E lithologically 10' H - Laminated silty shale, Yellow weather I - Ready Pay [[sketch in margin]] | | I -------| 1' | H -------| | 9 | G | -------| =======| F 1½' | E -------| D 4" | -------| C======| 1"C | 3' | B -------| 1' | A -------| | | Dol | [[/sketch in margin]]
[[circled]] 10 [[/circled]] M25 = NW 1/4 SE 1/4 NW 1/4 10 - 185 - 7w About 1000 feet NW of Wilson Ranch house. About 6 - 9" of sandstone, fine - grained containing fish fragments and conodonits. These were from 3' to 8' or 10' about dolomite. C-Z - 0 - 15 views of Black Range, of conodont beds, Lake Valley. BW - 1 - 22 - 29 - Conodont beds, at M25[[superscript]] 1 [[/superscript]] Visited Lake Valley - M25[[superscript]] 3 [[/superscript]] Apache Hill, SE 1/4 NE 1/4 SW 1/4 21 - 185 - 7W., Lake Valley (15') [[square]], N. Mex Nunn Member M25 [[superscript]] 2 [[/superscript]] - SW 1/4 SE 1/4 SW 1/4 21 - 183 - 7W., Lake Valley (15') [[square]], N. Mex.
[[circled]] 11 [[/circled]] [[left margin note]] M26 [[/note]] M26 - 2 miles E of Kingston A - Ready pay B - 20' of dark gray shale with layers of nodules, scattered nodules all well separated. Uchtospirifer C. - Bed of small nodules closely spaced little shale D. - 1 foot hard layer E - Nodular beds like C. [[Sketch of geologic column in left margin]] [[arrow drawn from top of column to bottom of B]] | | | | | 4' | E | |--------| | | 1' | D | |--------| Box | 3' | C | |--------| | | | | | 20' | B \/ | | ------|--------| Ready | ? | A Pay | | [[end sketch]] M26[[superscript]] 1 [[/superscript]] - About 40-50 feet of Box - N. Perch lst greenish nodular shale with few fossils. Black shale in contact with dolomite about 1/4 mi west of house M26[[superscript]] 2 [[/superscript]]- Full section Percha - Ready Pay in bed of Carbonate Creek. Box in Knob opposite sharp loop of road. Collecting poor. Box very shaly and silty - greenish with rather scattered nodules. Contact with dolomite showed light yellow - gray silty limestone followed by dark silty, white - streaking shale. Saw nothing that could be construed to be Oñate. Paurochyncha a foot from top of Box.
[[circled]] 12 [[/circled]] [[margin]] Sawpit Canyon [[/margin]] M26[[superscript]] 3 [[/superscript]] - At base of Ready Pay about 8' of very thin-bedded gray plate ss. very fine, grained. Box very thin about 20', also very shaly. To get to collecting place west of Kingston go up Middle Percha Creek one mile. The collecting is the north side of the Creek. Big area of Ready Pay. The section is much like that at Georgetown except that it is much thinner. Some estimates about 25' of Box above the hard bed, and 3' feet below it = 29'. Then there are 10 or 15' of the brown, scattered nodules making a total of 44 feet. In the large nodule bed Syringspira & Uchtospirifer[[guess]] occur with Composta. This seems to be restricted to this level. Pausoshyncha of large size also occurs at this level. We saw the contact of the dolomite and Ready Pay in 3 places, M26[[superscript]] 1 [[/superscript]], M26[[superscript]] 2 [[/superscript]] & M26[[superscript]] 3 [[/superscript]] but the first and second seemed normal as at Bear Mtn. At M26[[superscript]] 3 [[/superscript]] there were thin-bedded sands that Art may have called Oñate or Countillo
[[circled]] 13 [[/circled]] March 27 M27 - Contact dolomite & Ready Pay just E of Ready Pay Gulch. Lower beds sandy shale baked yellowish and red. Some irregular lumpy dark ss about 10' up. Fine-grained black. Plant fragment. Just east of NE cor SE 1/4 14 - 16S - 7W. on south bank about 30' above creek. Collection about 10' above contact, Another exposure higher up the hill. M27[[superscript]] 1 A - 11' - large scattered nodules in crumbly shale, Uchto., Composita. Acanthatia, B - One foot more compact nodules C - hard nodular ls. bed. D - 11' harder more compact nodular, blue weathering limestone E - hard limestone band of 9" F - Hard irregularly bedded nodular limestone here mottled pink, yellow, blue. Upper surface very irregular. The upper bed is not so crumbly and makes a steep face. BW1 - To end of roll Percha at Hillsboro. C2 - to 24 Percha south of Box 25 Shot at hill with type Percha [[sketch of geologic column in left margin]] | Miss. | --------| | 15' | F | --------| 9" | E --------| | 11' | D | --------| 1' | C --------| 1' | B --------| | 11' | A | [[end of sketch]]
[[circled]] 14 [[/circled]] 26 - 28 Cacti on N. side Box Arrived Tor C 3:30 Friday. Type section of Percha east of Hillsboro M27[superscript]] 1 [[/superscript]] Near center SW 1/4 SE 1/4 14 - 16S - 7W, 1/2 mile S of east end of the Box, 2 1/4 miles S 75[[degree symbol]] E of center of Hillsboro, Kingston (15') [[square symbol]] N. Mex
[[circled]] 15 [[/circled]] March 28 C2- Mud Springs Mtns from E. 29 Mud Springs Mtns. A - Quartz granules, small pebbles (Q) subangular, and fish fragments 1/2" Occupies pockets in Ord. B - Fine grained dolomite, the lower half somewhat weathered but the upper half solid and massive. Lower half light colored, breaking into small pieces, has a fine grain, silty. Saw no fossils. Upper bed has quartz, is a sandy dolomite, weathers browner than below, has brown nodules, probably altered pyrite. A fossils show on upper surface (2") Sehizophoria and [[erased words]]. This bed is 3' thick farther down outcrop to east. C - 6" of dark shale grading into overlying bed grayish brown, dark when fresh, light gray when weathered. D - 7 1/2' dolomite siltstone fairly solid in mid part but shaly at top. Abounds in C aurora at base and the same chonetid. with Ambococlia at top. Dark brownish gray when fractured in lower [[image - B sediment layers drawn with layer 1 labeled silty dol 1'5" and layer 2 labeled Sandy dol 1'5"]] [[image of sediment layers with labeled from bottom to top with Ord., A B 2'10", C 6", D 7 1/2', E 25', F 11', top indicates see next page]]
[[circled]] 16 [[/circled]] part, lighter at top where it weathers pinkish ash gray. Has a 6" solid bed at top. Some upper is dark in fracture. Upper bed with [[C. aurora?]] and Ambocodia. Hypothyndina found loose between beds B & C. E - 23 - 25' soft crumbly greenish to bluish shale, weathering yellow, scattered and distant nodules. Large Atrypa common - Sphoenspongia common 3 - 5' below top. This bed also contained [[insertion]] small [[/insertion]] Martinoids. F - Silty nodular yellow-weathering shale. Bed begins with nodular band and ends with a nodular band, orange yellow color. Fossils few: Atrypa, Seliz & Pugnoides & Productella G - 11' greenish soft shale ending in a 2' band of hard irregularly bedded silty rock forming a ledge. This bed is mostly covered by bulldozer work except for top. Atrypa, Leptostrophia [[line]] H - Greenish crumbly shale sparsely nodular, nodules small I - Nodular bed of small nodules tightly packed. Cystina. [[image - diagram depicting layers and notated F to K]] --------------- Pennsyl | various | ===============| N 5' | M ---------------| 7' | L ---------------| 9' | K ---------------| ** 10' | J ---------------| ** 3' | I ---------------| ** 12' | H ---------------| * 11' | G ---------------| * | F | **[[Sly?]] Gap *Onate ?
[[circled]] 17 [[/circled]] Left picket J - 10' flaky yellow shale atrypa & small Spirifer. K - 9' Small nodules tightly packed Top foot is nodular, next 2' below are shale like J. Thomasaria. L - 7' yellowish flaky shale M - 5' Bright green shale N - 4" bed with fish remains Conodonts. Above this bed comes 3' of light gray nodules with Spirifer accidentalls type spirifers. This is followed by a 4' cherty massive ls. and another modular bed with productids. = Pennsylvanian BWZ - 0 - 13 in Mud Springs Mtns. First 2 views are of a shale in the Pennsylvanian and not of the Devonian. CZ - End of roll in Mud Springs Mtns. Picture 30 is of Pennsylvanian shale not Devonian
[[circled]] 18 [[/circled]] To get to Davonian in Mud Springs Mtns. take 9th St west which runs to base of mountain to a radio station on hillside pass road to station, then take road that winds into base of hills. This brings one to a gulch containing the Devonian. This can be followed to the best locality which is just north of the highest peak. The Devonian is about 100' thick at its thickest but thins to 20' at the SE end. The section consists of Onate about 11' thick with a 3' sandy bed at base and a pebble zone on the limestone below that. Then nodular shale for 47. This contains large Atrypas at base with Martiniods and Sphaecospongia about 20' up. Above this bed is greenish shale with small nodules & Thomasaria 32'. This is followed by soft shale and green shale 12' thick. There is nothing in all this reminiscent of Percha. It is possible that the lower 58' is Oñate but I am not sure of the fauna of 12' - 58'.
[[circled]] 19 [[/circled]] March 29 North end Derry Hills about 1/4 mile N of Hot Spring. A - 21 feet of dark to black crumbly shale, some streaking brown. B. Fine-grained, very thin-bedded slaty sandstone with numerous markings on the surface C. bright green shale, crumbly like that seen at top of section in Mud Springs Mtns. 3'+/- = Post Devonian. Derry Hills Center E line SW1/4 SW1/4 29-17S-4W Section about 100 yds NE of spring at N end Derry Hills A - beds with Ambocoelia 3' like bed C at Mud Springs B - Soft shale with gypsum and pyrite pseudomorphs. Nodules in top. Martinia, [[strikethrough]] [[Pugnoides [[/strikethrough]] [[Hadroshynelia?]] near top C - 27' black shale with light brown streak D. Thin-bedded sandstone suggests Contadero E - 1 1/2' green shale with nodules containing post-Devonian fossils [[image - diagram depicting layers labelled A to C]] ?-----------| 3' +/- | C ------------| 17' | B ------------| 21' | A | [[image - diagram depicting layers labelled A to E]] Perm. ------------| 1 1/2 | E ------------| 16' | D ------------| 27' | C | ------------| 17' | B ------------| 3' | A |
[[circled]] 20 [[/circled]] Nackaye Mine Over 2 shafts M29' A - basal sandstone of Onate 3 - 4' B - 6' consisting of 8 [[insertion]] ^ limestone [[/insertion]] beds 2 - 4" thick separated by shaly partings of about same thickness C - Soft shale with gypsum. Upper foot red weathering. Atrypa Martinosa beds D - Pennsylvanian [[image - diagram depicting layers A to D]] | | D -------------| 8'- 9' | C -------------| 6' | B -------------| 3' - 4' | A -------------| ? | Near Center SW1/4 15 and NW1/4 22 - 17S - 4W, Caballo Mtns. At the mines on Nackaye Mtn a thin section consisting only of Oñate and the Atrypa beds is exposed. We measured about 20' at both ends of the outcrop. The Devonian is well exposed at the Mines although not mapped there. The road runs on the basal onate sandstone from the southernmost mine to the northernmost one. The Chonetes-Ambocoelia beds are well displayed at several places and the 8 - 10' feet of Atrypa beds is well shown under cobbly Pennsylvanian.
21. We saw no Sly Gap at Derry Hills but think that the approximately 50' of black shale and sandstone (17') at the top may represent the Contadero. At the Nakaye Mines neither Sly Gap nor Contadero equivalent are present. It is probable that erosion is responsible for this difference in thickening rather than thinning of the units. BW2 14 - 19 Derry Hills C3 0 - 8 Derry Hills
[[circled]] 22 [[/circled]] March 30 BWZ - 20 - 27 } Views at Hermosa C3 9 - 15 } [[image - in margin of page, layers of rock are shown with depth indicated inside each layer and letters written next to each layer]] ------------| | H ------------| 135' | G ------------| 4' | F ------------| Sly Gap 38' | E ------------------| { 16' | D {------------| { | C onate {------------| {7' | B {------------| { oooooooooo |A -------------------| | Pre-Dev | Hermosa B - of dark blue gray, ash-gray - weathering limestone containing C. aurosa and small Leptostrophia corresponds to C of the Mud Spring Mtns. area. C - Irregular sandstone layer with thick soft hematite modules, 2" [[arrow from A to above B]] A 15" of conglomerate, fine grained with small quartz grains. Some black shale intermixed. D Crumbly dark shale with Subcoretepora abundant in a hard bed of about one foot. Small Spinifer. E. Dark shale with scattered nodules in lower 10' but one band of 1' of thick nodules at 10 - 11'. Next 8' (11' - 19') without nodules. Next 19' to top nodular all the way. Nodules nearly black when fresh but ash gray [[margin next to F]] See next page [[/margin]] F - Four feet fine grained dark gray and brown ss. G - dark shale but lower [[insertion]] ^ 2 [[/insertion]] feet sandy
[[circled]] 23 [[/circled]] Shale with brownish gray streak H. bone bed at base Miss [[insertion]] ^ 2 or 3" [[/insertion]], above conus massive Mississippian _________________ Shaley ss. 3' {________________ Bed F {hard ss 7" {________________ shale 4" {________________ conodant bed 1 1/2" {________________ Remarks on Hermosa A - Conglomerate forming basal bed of Devonian. B - Exposed nearly all The way along The bill Sparingly fossiliferous but Chonetes aurora most common. Formal Hypothyridina but it is rare, Thickness fairly uniform. C - Sandstone, may have Conodonts. D - 16' of shale with upper part fairly silty and forming a hard bed guesstimated at 3 feet in places. Upper bed abounds in Sulcoretepora. Also contains Hypothyridina in upper part (hard bed). This probably corresponds to our Atrypa - Martinia beds of The Derry Hills. E - is quite definitely The Sly Gap. The contact between
[[circled]] 24 [[/circled]] D & E is a sharp lithologic break, the E being very dark shale and the D buff weathering. The nodules in E are not evenly distributed in the lower half but are fairly evenly and closely layered in the upper half. Fossils are very rare but are very distinctive. F. - At the base of F is an inch or two of sandstone abounding in conodonts and very suggestive of the conodont bed formed near the Wilson Ranch. Above this are 6 or 8" of shale then follows hard sandstone up to 1 1/2', brown weathering and forming a distinctive band. This bed strongly suggests the sandstone capping the Devonian in the Derry Hills. It is possible the sandstone and conodonts are Contadero. The lower 2' to 3' of the dark shale are sandy and are added here. G. - We saw no nodules in the black shale in any part of its extent. The black shale goes right to base of Miss. where there is a thin fish bed at the base
[[circled]] 25 [[/circled]] March 31 BW2 - 28 - 30 {chise C3 - 16 - 20 { Chise section N 40[[degree symbol]] E 12[[degree symbol]] S C - 2" with nodules & fish bone B - 110 feet of dark shale smooth dark gray almost black. White streaks. Upper part 2 - 3' discolored to green, or in places red and yellow. Pyrite nodules. Upper beds lumpy, slity. Chonetes 15' from top. A - 19 feet of sandy dark gray shale with layers of limey sandy nodules. These contain Atrypa, small Spinifer and Schizophoria about between 5 and 10' from base. Top 6'6" has thin conodont? bed of less than an inch. Then below 6" sandy sh. The 6' of crumbly sandstone with 4 hard bands respectively from top 6", 6", 6" and about 10" separated by sandy shale: 6" - 12"; 6" - 12", 6" - 15". below 10" band is 8' of the nodular sandy beds and below them comes about 4 - 5' silty shale. The section is about 21' thick. We think that A is the equivalent of the Atrypa-Martinia Zone and no Sly Gap or C. aurora beds are present. [[description of illustration in left margin depicting layers discussed above:]] ---------| | C ---------|--|----------| Chonetes | | 15' | ---------|--| | | B 110' | | ========= Conodont bed-|--| 6'6" | | ========= 10" =========| | 8' | | 21' A -----------------------| | 5' | | -----------------------|--| Montoya | -----------------------|
[[circled]] 26 [[/circled]] Apil 1 C3 Tor C 21, 22 Derry Hills from S 23, 24 Red Horse Mtn. A - 3' feet of soft red shale B - 13 feet of yellow weathering greenish shale with layers of gypsum Large Martinia and atypa[[?]] C - 5 feet dark silty shale, lumpy weathers yellow gray. D - 11' feet of massive blocky reddish brown fine - grained sandstone Dark gray when fresh. This looks Where 11' thick upper 2' are platy, lower 9' massive E - Shale mostly dark gray in lower part crumbly, white streaking Greenish in upper part See next p. [[sketch]] -----------| | 95 - 120' | E | -----------| 5- 11' | D -----------| 5' | C -----------| 13' | B -----------| 3' | A -----------| Pre DW | [[/sketch]] Main ^[[measured]] section center NW 1/4 NW 1/4 14 - 18S - 3W., Red House Mountain, near Hatch, N. Mex. Main collection SW 1/4 SW1/4 SW 1/4 11 - 18S-3W. just east of Bauxite mine.
[[circled]] 27 [[/circled]] B - some of this shale forms thick lumps and is not crumbly. Lower 7' with pinkish nodules. Section above black sh [[sketch]] | Perm. | | ----------| 15' | Taonurses[[?]] bed massive reddish | weathering ss. ----------| 6' | shaley sandstone with no gypsum ----------| 5 or 6' | Shale with gypsum ----------| ----------| 6 or 8" with fossils Dev Blk. | 95 - 120' to green | shale | [[/sketch]] C3 - 23 - 27 } Red House Mtn. BW2 - 31 - 34 } Barite Mine
28 Remarks on 4/1/64 This section is like that of Haystack Canyon seen years ago. No bed with Ambocoelia or C. aurora were seen but highly altered beds between these and the dolomite might represent them. The beds A and B belong to our Atrypa-Martinia beds. The capping sandstone contains conodonts and may be the top of the Devonian. 95 - 120 feet of dark and green shale follow the sandstone. Saw no fossils in it. On top of this is thin reddish ss, band with Miss. fossils. Then follows 6' of shale with gypsum and Rhipidomellas. This is followed by Taonurus sandstone which is overlain by Pennsylvanian, all of this belongs to the Miss. Audrecito formation. The age of the 120 feet of dark shale is thus a problem: is it Devonian or Mississippian
[[circled]] 29 [[/circled]] April 2. Cooks Range C - 3 {28, 29 Cooks Range {30 Hyatt Ranch, Cooks Range In pockets in the Fusselman come fine-grained sandstone and conglomerate. The former having conodonits. The shale at the contact and for at least 1/3 the way up is real black shale that streaks brown. C3 - 30 to end - Cooks Range BW2 - 35, 36 Cooks Range C4 - 0 - 2 Fort Cummings BW3 - 1 Cooks Range Conodonts from NW 1/4 NW 1/4 24 - 20 - 9 W, one mile NW of Cooks, N. Mex Fossils from SE 1/4 NW 1/4 NW 1/4 24 - 20S - 9 W One mile NW of Cooks, N. Mex The dark shale is given by Landon & Bowsher as 95' thick which seems correct. Above this is the nodular bed. This suggests the lower nodular bed of the Percha, the greenish gray nodules
[[circled]] 30 [[/circled]] Landon and Bawsher have 40 feet of nodular limestone from which they record Paurorhyncha Syringspira etc. The typical fauna of the lower nodular bed of the Percha. But the nodules at Cooks Peak are thick (up to 4") and platy, actually producing layers at some levels. In the upper the nodules weather to orange yellow. When broken the nodules are nearly black or dark gray and usually weather light gray. They are not the greenish gray of the nodules in the Silver City area. Furthermore the nodular bed is much thicker at Cooks Peak, at least twice as thick. At the top of the Percha at Cooks Peak on the slope of the canyon on the south side the nodules extend to within one foot of the fish-bed at the base of the Mississippian. Near the road however in the small fault block and to the east 2 to 5 feet of platy, irregularly bedded sandstone occurs beneath the fish-bed. This sandstone is suggestive of the 17 foot bed in the Derry Hills.
[[circled]] 31 [[/circled]] April 3. Section at Martinia Cut (Paint Mine) NW¼ NE¼ 27-17S-4W Caballos Mtns. A - 12 feet of pink silty shale abounding in Atrypa B - 7 - 8 feet of platy greenish gray sandstone exposed about 100 feet to the south in a gully. [image - diagram depicting layers]] ----------| Penn. | ----------| Sandstone | 7'- 8' B ----------| Beds with | A Martinia | | At the paint prospect the 3' between the shale and Penn. is mostly covered but nodules in the float indicate nodular Penn. as the top of the shale. The sandstone evidently lenses in and out. Lithologically the ss looks like the upper stuff at Derry Hills but Tom thinks it is the same as the ss below the black shale at Red House Mtn. In one gully on the flank of the mountain dark shale appears above the red shale and below the Penn. but what thickness is not known. Mine near large boulder on slope of Mtn.
32 South end of Caballos Palomas Park [[geologic column in left margin with description of rock units on right]] [[vertical margin note with bracket encompassing units J K L below]] Taonurus [[/note]] Penn. | --------------| M 11'| Fine grained ss, red weathering Taonurus --------------| L Shaly ss 8'| with Taonurus also 8' makes a short slope --------------| K Taonurus 14'| Reddish weathering, yellowish sandstone with Taonurus. Makes sandstone | massive cliff. --------------| J 25'| Platy fine grained ^ss interbreeds of reddish loss. ls. | yellowish to red weathering fine grained sandstone --------------| I Green 10'| shale | --------------| H | Fossiliferous ss. small Miss Spirifers 10" --------------| G Green 23'| shale | --------------| F Black 105 | NE 1/2 23 - 185 - 3W shale | Caballos Mtns. --------------| E | Conodont bed 1/2" --------------| D Light gray | 7' - yellow weathering greenish silty sandstone silty ss | --------------| C gray silty | 6' Nearly black shale crumbly | shale | --------------| B 2'| Fine shale with thin beds of ss from 1/4 - 1 inch thick 2' --------------| A 7'| blocky siltstone - might be Martinia zone --------------| [[end of sketch]]
[[circled]] 33 [[/circled]] To get to Palmer Park localities at SE and Caballos Mtns. take Willow Lane past Gillis house, follow Willow Lane North turning sharp right (SE) to Palmer Park. Willow Lane intersects US 85, 2.7 miles NW of intersection of US 85 and NM 26 in west end of Hatch. It is also about 0.7 mile NW of bridge over Rio Grande on US 85. Locality at SE end Caballos Mtn of 4/3/64 is like that seen on April 1 but all of the Units in the Miss (H - M) are thicker. Bed A may be the upper part of the Martricia Zone but we found no fossils to prove it. The ss (bed D) is much weathered and siltier that the one a mile NE. BW3 - 2 - 5 Nackaye Mines C4 - 3 - 9 Nackaye Mines but one view (3) toward Black & Cooks ranges from Nackaye Mtn.
April 4 [[encircled]] 34 [[/encircled]] Escondido Canyon SE 1/4 SE 1/4 26 - 18S - 10E. [[sketch of geologic column takes up entire left margin]] A - conglomerate of sandstone matrix with small quartz pebbles and coarse sand grains, weathering brown and enclosing angular pieces of dolomite up to 3". On top is 2" of fine-grained light sand Conglomerate fills cavities in dol. up to 9" - 1' B - Fine - grained sandy dolomite crumbly at base but forming hard ledge at top. Pyrite streaks and (worm - tubes) in lower 2'. Dark gray weathering yellowish brown and ash gray. Upper foot contains Leiorhyrichus, ambocoeloid and a chonetes. C - Crumbly, lumpy calcareous siltstone with 3 (2 - 3") nodular beds of lime, each separated by 8" - 10" of crumbly rock. At the top of this five - foot interval large Scilcosetapora[[?]] occurs. Atria becomes after 10' above base. Small Chonetes common throughout. Weathers pinkish to yellow - gray. Dark greenish gray when fresh [[symbol for new paragraph]] D The top 2 to 7' are hard, weather rusty brown and make a conspicuous ledge that juts out of the hillside because it is sandy. [[margin sketch follows]] ----------------| |Hard ls. 2' ----------------| Cobbles 3' | ----------------| Rusty ls 1' | ----------------| Cobbly & | sh with | thin ls. 22' | | Massive 1' | Cobbles & sh 9' | Massive 1' | Layered cobbles | I [[bracket from bottom of unit I to top of column]] 49' Green sh - 8' | Massive 1 1/2'| Cobbles 3' | Massive 2' | Cobbles 2' | ----------------| 6' | H ----------------| 6 1/2'| G ----------------| 5' | F ----------------| 10' | E ----------------| 2 - 7' | D ----------------| 14' - 19' | C ----------------| 5' | B ----------------| XXXXXXXXXXXXXXXX| A ----------------| Fuss. | | [[end of sketch]]
[[circled]] 35 [[/circled]] D is 2 - 7' of sandstone E - Crumbly and like C but more massive, clumby, perhaps softer. F - Fine-grained ss. rusting reddish with a 4" bed of crumbly ls like E about 1 1/2' below the top G - silty stone grading into ss at top, mostly dolomitic siltstone with the top 6" become sand. Crinoid stems (Melocrinus?) abundant H - Shaly siltstone weathering into small crumbs. Overlain by cobbly Caballero Lower foot laminated I - Caballero BW3 to 7 - 1/4 mile southeast of Escondido Canyon - Oñate fm. C4 to 16 4 views of Sacramento - 3 N toward Dog Canyon, one South Remainder of Oñate SE of Escondido Canyon. A - G = Onate H = Sly Gap?
[[circled]] 36 [[/circled]] [[underline]] Sly Gap [[/underline]] SE 1/4 NE 1/4 26 - 11S - 5E [[sketch of geologic column in left margin with description to right]] Miss ------------ | Sh 6" ----------| | Brown ss 2' ----------| | shale with nodules 1' ----------| | sandstone, brown 3' ----------| | sh 4" ----------| | sandstone, brown 1'8" ----------| | shale 4" Large Spinifer? ----------| [[two headed arrow from here to top]] 9' Thoroughgood Fm Flower 3 1/2' | Limy nodular dark blue sandy ls. Spinatrypa large coral. 3 1/2' ----------| 12 1/2' |} bluish weathering platy ss with shale interbeds, sands from 1" - |} 1' in thickness ----------|} 1' |} ----------|}} 17' 3' |} ----------|} 1/2' |} ----------| 6 - 11"| Sandy ls thin beds in dark shale, mostly shale ----------|[[two headed arrow from here to top of 3 1/2' unit]] Contadero 3" | Fine grained sandstone with conodonts 3" ----------| 21' | More massive, hard, large crowded nodules, Atrypa, one massive | 15" bed 5' below top. Small Mcgea at top 4'. Also small Atrypa | common. ----------| 15' | Hard, crumbly green gray shale with Thomasaria near top ----------| 4 1/2'| shale with Atrypa ----------| 3' | nodular beds | [[arrow to bottom of this unit with vertical margin note | indicating the layers from here up to the 3" bed are all Sly Gap | Formation]] Sly Gap ----------| [[ solid line across page]] End Sly Gap next page | sh 6' - 7' Lower part from section 25. ----------| 9' |Fine - grained ss 9' ----------| 6" | Fine reddish ss, wormy ----------| 9' | Fine shaley ss breaking into small rounded lumps light gray ----------| 1' | ss fine crumbly ss, wormy markings & Atrypa, Schizophora ----------| 5 1/2'| Sandstone reddish weathering, hard fine grained, crinoid segments ----------| ==========| Conglomerate 1" | [[end of section]]
[[circled]] 37 [/circled]] Center NW1/4 SW1/4 25-11S-5E [[sketch of geologic column]] Sly Gap ---------| Dark sh | & ss. | ---------|-------------------------------------| 3' | sandy Donvillina & Mcgea | ---------| | 8' | cobbles | ---------| | 1/2" | ss | ---------| | 2' |cobbles | ---------| | 1/2' | ss | ---------| | | 38' | 11' | Dense cobbly beds | | | ---------| | 1' | sandy ledge | 49' ---------| | 4' | Fine cobbles sandy sh | ---------| | 1' | sandy ledge | ---------| | 2' | cobbly | ---------| | 8" | sandy | ---------| | | | 10' | Fine cobbles [[fasina?]] as below | ---------| | | sandy bed 2" | ---------|-------------------------------------| 5 1/2' | Fine cobbly sh. Many flattened Atrypa, wide | Sulcatostrophia McGea Calvinaria Mcgeea ---------| 3" | [[Hard?]] ---------| 7' | Dark sale ---------| [[arrow from bottom of 7' layer to 9' layer below indicating continuation of section]] ---------| 9' | Fine grained shaly ss ---------| | 6" reddish ss ---------| 9' | ss crumbling to lumps ---------|-------------------------- See p 46 1' | crumbly ss ---------| 5 1/2' | Thick reddish ss ---------| 1" | cgl. 1" ---------| | [[end of section]]
[[circled]] 38 [[/circled]] April 8 Hembrillo Canyon Center SW 1/4 2 - 16 S - 4E, San Andres [[sketch of geologic column in left margin with description to right]] | ------------| 2' | brachiopod coquine, pockets of ss at base 2 - 3" thick. Nodules | dark ls like Caballero ------------| T 6' | gray - black fissile sh. ------------| S 2 1/2'| Siltstone dark gray, Camarotoechia, Tylothyris ------------| R 2- 2 1/2'| sandstone - fine grained dark gray brown weather ------------| Q 53' | Sandstone, shaly dark gray siltstone purple weathering, ss makes | ledges 2 - 3" thick. Fossils in lower 5' abundant Coll. made ------------| P 1 1/2'| Purple shale lower 1/2' dark ------------| O 2 1/2'| Hard calc. siltstone, much crinoid debris Pugnoides ------------| N 3 1/2'| Dark shale, medium gray silty Large Spinatypa [[insertion]] ^ [[Aulercella?]] [[/insertion]] ------------| M 11' | Massive dark bluish nodular hard ls, burrows [[calsomaria?]], ------------| L 7' | Thin sandy ls. bands 3" - 6" with shale interbeds | shale with light worm - making S - burrows. ------------| K 4' | Nodular beds ------------| J 10' | Dark poorly foss silty sh., limy bed 2" | Thomasaria, Pugnoides, Cariniferella, Attypa [[Dorur?]] ------------| ==== 6" ====| 4" | I Dark shale with numerous small nodules [[?Docivillnella]] & [[Calvinaria?]] ==== 6" ====| [[two-headed arrow from top to bottom of unit I]] 11 1/2' 11 1/2'| ------------| H 5' | Black white - streaking shale ------------| G 1 1/2'| Laminated X - bedded dark brown ss. light brown - gray inside | quartzic L[[remainder erased]] ------------| F 3' | yellow weathering dark [[insertion]] ^ gray [[/insertion]] platy dolomitic siltstone ------------| E 1' | Top & bottom 3" of sandstone with shale between - fine grained ------------| D 6 1/2'| dark gray shaly siltstone ------------| C 3' | Ledge of hard massive fine grained quartzic sand Reddish 1 1/2' | weathering[[? Leiorhynchus]] C ------------| B 4' | Crumbly nodular fine - grained ss [[?Leiorhynchus]] ------------| A 3' | Covered 3' ------------| Fuss. | [[end of sketch]]
[[circled]] 38 [[/circled]] C4 to 24 - Sheep Mtn & Sly Gap BW3 to 15 - " " " " " [[Dittos for: Sheep Mtn & Sly Gap]] Morning SE 1/4 NE 1/4 26 - 11S - 5E Afternoon Center NW 1/4 SW 1/4 25 - 11S - 5E Rousseau collected large rhynchonellido from Contadero in Sly Gap. Our section at Sly Gap Thorogood - 9' Contadero - 31' Sly Gap - 43 = Onate - = At the morning locality where the Contadero was measured a gap of 17 feet existed between the lowest bed (3' of nodules) and the top of the basal sandstone of 5 1/2 feet. Near the top some sandy shale was seen but the basal beds were worked out from the sequence in section 25.
[[circled]] 39 [[/circled]] F has Aulopora, crushed Leioshynchus A - G = Onate 22' H - O = Sly Gap 54 1/2 P - T = Contadero 65 1/2 C4 - to end of roll Hembrillo Canyon cactus, view of Mios Reefs from US 70, N of Alamogordo BW3 - to 22 Hembrillo Canyon
[[circled]] 40 [[/circled]] April 9 Deadman Canyon Turnoff to Hembrillo is 14 miles S of Rhodes Canyon on road on E side Range C5 - 1 Entrance to Hembrillo Canyon C5 - 2, 3, 4 " " [[Dittos for: Entrance to]] Deadman Deadman 21 miles S of R. C. C5 - 5 - 11 Flowers, mouth of Deadman Deadman Canyon Center NW 1/4 SE 1/4 12 - 17S - 3E. A Dark dolomitic siltstone 19' some soft & crumbly in these beds but mostly fairly thick layered 6" layers, gray ash to brownish weathering No fossils seen B - Dolomitic fine grained dark gray brown weathering sandstone with numerous Leiorhynchus valves C - Thin-bedded (1" - 2") dolomitic siltstone Sulcoretepora 6' below top, also Leptostrophia D - Fine grained thick gray, rusty weathering dolomite sandstone. Massive stands out as ledge. Pyrite in upper 1/2' also large Atrypa E - covered
[[circled]] 41 [[/circled]] [[sketch of geologic column in left margin]] F - silty crumbly shale, dark, no fossils seen. Plant fragments G - Covered H - Nodular siltstone, nodules distant MacGeea, Sulcatostrophia, Cariniferella Fossils very rare. Top 2' with focoidal markings. Picture taken {25 Fucoidal markings BW3 - {26 Upper Sly Gap I - Thin - bedded shale of 1' - 3' separating nodular limestone beds 4 - 8'. Shale beds with fucoidal markings. MacGeea, Pachyphyllum, Pugnoides. Pachyphyllum 4' above base. Bed with common MacGeea 10' above base. Scattered black nodules near top. Conodonts & fish fragments on top surface of I. = J. J - 1" conodont bed on top of I K - Light bluish gray ss, irregularly bedded with 1' hard band at top and another 2' below. Upper 1/2 of separating bed is purple L - Silty shale with hard fine grained SS at top, dark gray 4" Arubocoelia, Aulacella. Tylothyris in top 4" | Caballero | P 10' | ---------------| 7' | O ---------------| 8" | N ---------------| 15 1/2 | M ---------------| Ambocoelia | 6' | L ---------------| 8' | K ===============| | J ---------------| 18' | I ---------------| 19 1/2 | H ---------------| 7' | G ---------------| 8' | F ---------------| 3' | E ---------------| 4 1/2' | D ---------------| 19' | C ---------------| 1' 4" | B ---------------| 17' | A ---------------| A' 2' | Covered ---------------| | Fusselman [[end of sketch]]
[[circled]] 42 [[/circled]] M - Dark crumbly shale with a hard sandy bed 11' above top. N - 8' sandstone with fish fragments and conodonts O - Consist ^[[from bottom]] of a 3' Taonurus[[guess]] bed, fine-grained crumbly dark as 3 1/2' then a foot of harder ss with Toomus[[guess]] P - blue cobbly beds with 4' at base with few nodules, next 6' with large crowded nodules Block chert comes in abundance 10' stull farther up. J. - M Contodero 29 1/2 E - I Sly Gap 55' A' - D Onate 43 1/2' 128 BW - to end of roll Deadman Canyon C5 - 0 - 18 Deadman Canyon
[[circled]] 43 [[/circled]] Floyd S. Adams - Range Rider Bear Canyon April 10 A - On Fusselman, irregular surface of Fuss. with hematite skin but no sand. Leached silty dolomite ash gray in color, soft crumbly with some (5) harder nodular beds 4 - 5" thick. Styholina 6' above base, Ambocaelia 9' above. A little farther up stream the Ambocaelia bed is fresh and is a black hard ls with conchoidol fracture B - crumbly dark shale - Ambrocoelia at basal 2" C - Sanstone fine grained, thin bedded rough surface, weathers brown and upper part and has water markings Lower part heavier bedded weathers purplish, contains beak ends of Leiorhynchus in abundance, Lingula Fish fragments, upper half with some fine shaly sandstone. Leiorhynchus bed is 3" - 4" thick. D - Dark to black fissile shale weathered purple in patches E Overlying the black shale are 1' of densely packed cobbles followed by 4 - 6" of dark shale [[Sketch of layers]] ------------| | G ------------| 20' | F ------------| | E ------------| | 52' | D | ------------| 1' - 1 1/2' | C ------------| 14" - 2' | B ------------| 9' | A ------------| Fuss. | |
[[encircled]] 44 [[/encircled]] On top of the thin shale 9" band hard limestone. This is followed by the main mass of the Caballero The cobbles (lower) are bluish, wrapped in a bluff sandy shale F - About 20' cobbly ls. - Caballero G - 1' brown as with a Spirifend. Locality N of old house & 2 mines on S and West of one mine on N side of canyon BW4 - 0 - 3 Bear Canyon C5 - to 25 Bear Canyon and (24 - 25)) White Sands.
[[circled]] 45 [[/circled]] April 11, 1964 Went up Mule Canyon and took second gully on north side and climbed up to the bench on the Fusselman to reach the Sly Gap wash exposed on the front of the Mountain. In morning we collected the wash 3/4 mile N60[[degree symbol]] E of the canyon mouth. In the afternoon went to a wash on the Mountain front 1/4 mile farther north. These washes expose the lower Sly Gap. The lowest cobbly bed had Nervostrophia but little else, this is followed by dark shale, then another cobbly bed Near the shale - cobbly bed contact [[underlined]] Calvinaria [[/underlined]] is common. The upper part is dense cobbly and in this were seen large [[underlined]] Spinatrypa, Hypothyridina, Ambothyris [[/underlined]] and [[underlined]] Pugnoides. [[/underlined]] Both washes are small and are now much depleted.
[[circled]] 46 [[/circled]] April 12. Took Grapevine Canyon road to section 25 to collect Cryptacanthia. This brachiopod occurs through 5' of rock but is rather sparsely scattered. The Stenoscisima also occurs in all parts of the Cryptocanthia bed. The Koglowskia layers are above the Cryptacanthia. Came home about 3:30 and packed 2 boxes, 7 blocks and one bag. April 13 Back to Sly Gap. BW4 - to 11 Sly Gap C5 - to end First went to locality in NW 1/4 SW 1/4 25 - 11S - 5E. This is the best section of the Devonian at this place. At the base in the Oñate about 9' thick. The next bed 18 1/2' on page 37 which we thought to be Oñate is in reality the Sly Gap, The MacGeea zone of Stevenson. We found Pugnoides, Cyrtina, and Macgeea but fossils are not common at this place
[[circled]] 47 [[/circled]] We divided the Sly Gap into 2 parts the lower about 22 1/2' (not including the 18 1/2 feet just above the Oñate The lower part of this division which is mostly of small numerous but scattered nodules. Atrypa is very abundant, together with Colvingria Suleatostrophia and Devonoproductia The upper Sly Gap (25') is of closely compact dark blue cobblers This part is very distinctive. Tom found Hypothyriduia just above the basal hard bed. Fossils get larger upward. Colonial corals appear near the top. After lunch collected at the base of the Thoroughgood formation. The 8" to 1 foot on the Contadero bed abounding in Sprinatrypa, contains black nodules at the base and Leiorhynchus and spiriferoids as well as an Atypa like [[underlined]] augelica. [[/underlined]] The Spinatrypsa bed of the Contodero overlies the thin sandstones of the lower part of the Contodero. It is cobbly when weathered, dark bluish and strongly resembles the upper part of the Sly Gap.
[[encircled]] 48 [[/encircled]] April 14 Alamo Canyon [[left margin]] [[image - sketch of 11 geologic layers. Inside each layer denotes either the depth or other pertinent data regarding content. To the right of each layer is an letter.]] [[image labels]] [[vertical]] Caballero 54' [[arrows pointing to top and bottom of page]] [[/vertical]] K 2' J 3' I 2 1/2 ' H 7 1/2 G 23' F E 16' D 17' C 2' B 7' A Fuss. [[/image labels]] [[/left margin]] A - 7' sandstone, fine grained in layers 6" - 8" thick separated by dark silty shale, almost black No fossil seen B - Fine grained dolomitic ss, dark gray weathers yellow brown. Top layer with worn burrows & small pyrite masses. C - 17' Alternating fine grained ss and silty shale, the ss in beds 1' - 2' thick. A small spiriferoid in base Leiorhynchus 10' above base in a 1' sandstone. Top of C is a 2' solid fine grained ss., weathers reddish. Top bed has Leiorhynchus D - Irregularly bedded dolomitic siltstone with Leiorhynchus 12' above base. Weathers yellowish but is dark gray when fresh E - 1" reddish brown ss, fusoidal markings F - Dark crumbly shale dark in lower part, greenish above Thin dolomite siltstone 1" thick 5' above base. [[underlined]] Colvinaria [[/underlined]] 15' - 20' above base Cariniferella
49 G - Yellowish nodular silty limestone H - 2 1/2 of silty ls. in 4 layers. The two bottom one 2" thick separated by 3 - 6" greenish shale Top unit 1 1/2' thick, contains Spinatrypa & Ambothyris. I - Nodular silty ls like G. {Silty fine grained dark ss 10" J - Fish Bed {Fish-bed 6" {black sh 10" K - Caballero 54 feet. BW4 - To 20 Alamo Canyon C6 - 0 - 15 " " [[dittos for: Alamo Canyon]] A - E = Oñate = 42' F - I = Sly Gap = 36'
50 Caballero section - Alamo Canyon A - Consists of a lower foot of black shale followed by 6" of brown sandstone with fish remains and conodonts, topped by 10" of dark siltstone for a total of 26" = 2[[erasure]] 1/2 [[/erasure]]' B - Eight feet of hard, bluish nodules, smooth blue gray on the exterior, dark limestone inside. Makes a compact unit, some of it particularly the top 2' or 3' feet forming a resistant shelf. This contains Shumardella (2 sps.), small Spirifer and Geniculifera. C - 45' mostly of nodular limestone with limy shale surrounding nodules. Breaks down into a slope of cobbles. Cobbles not smooth but peppered with bryozoa and dark crinoidal debris. Fossils seen are: large Schizophoria, Rhipidomella, Schuchertella, large Spinifer, Bachythyris, large productids, Cleiothyridina [[sketch of geologic column in left margin]] Overlying | thick bedded| ls. | ------------| 24' | | | 1'==========|C 3' | 1 1/2'======| 3' | 1'==========| 12' | ------------| | 8' |B ------------| 2' |A ------------| Sly Gap | [[end of sketch]]
[[circled]] 51 [[/circled]] April 15. Sent 5 boxes and 7 blocks from the Cryptocanthia beds on the Grapevine Canyon road. Sent blocks via Navajo Freight Lines, a bus line. Left Alamogordo about 10:30 and arrived in El Paso about 12:00 P M. Went to airport and bought tickets for flight from Okla. City to Washington. About 2:00 P M called on Speedy Nelson at Texas Western University. Speedy gave me a fine specimen of Spinifer from the Wolfcamps opposite (about 3 miles) east of Vinton, Texas. In evening called on Tom's sister-in-law.
[[circled]] 52 [[/circled]] April 16 Left El Paso at 7:30. Visited locality 1/2 mile N of Hueco Inn where we collected a fair number of productids. Called at Pine Spring Camp to see the Glovers at 10:30 A.M. Stayed till about 11:00. Then went down to Pinyon Tank. The road to the Tank now is in fair shape and we had no trouble getting to locality 731, hill 5130. The collecting was all from the NE edge of the hill. We took 12 blocks from the hill. These, we wrapped after arriving at Van Horn. These blocks are all from locality 731. Goniatites are fairly common in the Brachiopod bed. C6 - to 20 - cacti at 731
[[circled]] 53 [[/circled]] April 17 Sent off 12 blocks of 731 from Van Horn 835 pounds. C6 - First roll of Agfachrome C7 - 1 Macdonald Observatory Arrived in Marathon at 12:00 noon, went to hotel. After lunch went to Decie Ranch Walked over section to see Leonard limestones. On the NE side of knob 5250 just W of 5300, patches of bioherm appear in the conglomerate. These contain [[underlined]] Institella [[/underlined]] and an assemblage similar to that of Ls #2 which is excellently displayed under it in the same hill. What bearing does this have on the correlation of the limestones with those on Dugout Mtn. BW4 - to 25 - view of Leonard #2, Leonard #3, Shale between L2 & L3 on knob 5250. C7 - 2 - 7 cacti on Decie Ranch, Crinoidal ls. block