Field notes and maps from Glass Mountains, West Texas, 1963b

ID: SIA RU007318

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

Form/Genre: Fieldbook record

Date: 1963

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

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This field book documents Cooper's paleontological and geological field work in Glass Mountain, West Texas from 22-25 April 1963. These notes mostly contain notes on geology, although coral, sponge, and brachiopods are noted. Locations include but are not limited to Windmill Hill, and Hess Ranch. Some coordinates are included.

Date Range


Start Date

Apr 22, 1963

End Date

Apr 25, 1963

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


  • Geology
  • Paleontology


  • Windmill Hill
  • United States
  • Texas
  • Hess Ranch
  • Glass Mountains


  • 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


Box 35 Folder 12

[[circled]] 1 [[/circled]] Hill 5300 April 22, 1963 [[margin]] Unit No. [[/margin]] Rock Type [[right margin]] Apparent Thickness [[/right margin]] [[left margin]] [[encircled]] 1 [[/encircled]] [[/left margin]] Chert Pebble conglomerate [["with" symbol]] coarse ls. matrix Fresh color - light brownish grey - weathered color - tan chert pebbles up to 1 inch. [[right margin]] [[6 tally marks]] +8.8' [[/right margin]] [[left margin]] SP=97 [[PT?]]=202 DR=50' [[/left margin]] Fossils: ? [[underlined]] Neospirifer [[/underlined]], large [[underlined]] De-byia[[?Derbyia]] [[/underlined]], [[underlined]] Ortho-oechia[[?]] [[/underlined]], corals, huge crinoid hash, [[underlined]] Omphalotrochus [[/underlined]], [[underlined]] Scacchinella [[/underlined]] (small), [[underlined]] Entellites [[/underlined]], [[Leptotids?]], [[right margin]] [[underlined]] 42' [[/underlined]] [[/right margin]] Top of ledge (dip 5-10[[degree symbol]]) Covered slope - [[right margin]] 9.6' [[/right margin]] [[circled]] 2 [[/circled]] Platy calcarenite [[with symbol]] chert pebbles [[with symbol]] large rusty chert nodules [[right margin]] 5.5' [[/right margin]] In gully [[circled]] 3 [[/circled]] Lenticular calcarenite [[with symbol]] rusty patches [[right margin]] 5.5' [[/right margin]] Covered slope [[right margin]] 27.5' [[/right margin]] [[circled]] 4 [[/circled]] Calcarenite congl. [[with symbol]] pebbles & granules of rusty chert [[right margin]] 11' [[/right margin]]
[[right aligned, column]] 5.5 6 ____ 33.0 8.8 ____ 41.8
[[circled]] 2 [[/circled]] Apr. 22 Hill 5300 Grant level - eye hight 5.5' [[left margin]] [[diagram]] [[/left margin]] Covered slope of 2 [[levels?]] [["with" symbol]] [[right margin]] 1' [[/right margin]] of rusty lime at the top [[right margin]] 10' [[right margin]] Shale - brownish green [["with" symbol]] greenish brown ls. beds (1' thick) about every 10'. ls. is [[?]] Dip approx. 11°. [[right margin]] 27.5' [[/right margin]] [[left margin]] [[encircled]] 6 [[/encircled]] [[/left margin]] Shaly limestone - brownish color. 6-12" ls beds [["with" symbol]] 6" to 3' of shale between ls. beds. [[right margin]] 11' [[/right margin]] [[left margin]] [[encircled]] 7 [[/encircled]] [[/left margin]] Grey and brown shale [["with" symbol]] 6"-12" bed of brown siltstone in middle about 11' above base. [[right margin]] 22' [[/right margin]] [[left margin]] [[encircled]] 8 [[/encircled]] [[/left margin]] Thin to medium bedded plates ^[[limy]] siltstone [["with" symbol]] intercalated shales, lime increasing toward the top [[right margin]] 33' [[/right margin]] [[left margin]] [[encircled]] 9 [[/encircled]] [[/left margin]] Conglomerate [["with" symbol]] chert pebbles and ls. pebbles [[strikethrough]] [[?]] [[/strikethrough]] boulders; large crinoid stems. [[underline]] Streptorhynchus [[/underline]] or [[underline]] Diplanus [[/underline]] [[right margin]] 5.5' [[/right margin]] [[left margin]] [[encircled]] 10 [[/encircled]] [[/left margin]] Evenly bedded ls. [["with" symbol]] layers of rusty chert & intercalated 10-12" beds of silty shale. Lime becomes [[right margin]] 23' [[/right margin]]
[[25th?]] [[left margin]] [[encircled]] 3 [[/encircled]] [[/left margin]] less silty [["with" symbol]] fossils appearing at the top. [[underline]] [[Derbeja?]] [[underline]] ?, Fossil collected at the top. 4-22-1 Previous 4 units are brown in color. [[left margin]] [[encircled]] 11 [[/encircled]] [[/left margin]] Grey conglomerate; large lime cobbles chert pebbles, large crinoid stems, [[underline]] [[Meekella copanala?]] [[/underline]] ?,[[underline]] Neospirifer [[/underline]], [[underline]] Hustedia [[/underline]], [[underline]] Diplanus [[/underline]], [[underline]] Orthotoechia [[/underline]], [[underline]] Enteletes [[/underline]], Syringopora type coral, Top bed is grey limestone. [[right margin]] 9.5' [[/right margin]] [[left margin]] [[encircled]] 12 [[/encircled]] [[/left margin]] Even bedded cherty limestone in beds 4-10" thick [["with" symbol]] occasional intercalated " beds of [[thin?]] bedded siltstone. [[underline]] Leptodus [[/underline]], [[underline]] Hustedia [[/underline]], 3" bands of rusty chert. (4-22-2)? [[underline]] Spyridiophora [[/underline]] Platy siltstone top 6' [[right margin]] 7 38.5' [[/right margin]] [[left margin]] [[encircled]] 13 [[/encircled]] [[/left margin]] Tan conglomerate - very poorly sorted chert pebbles, ls. cobbles and boulders. [[right margin]] 5.5' [[/right margin]] [[left margin]] DR= [[/left margin]] Good ledge-[[former?]] [[?]] slope [[right margin]] 9.5' [[/right margin]]
[[right aligned, column]] 55 27.5 ___ 82.5 24 5.5 ___ 120 120 ___ 132 56 5.5 ___ 280 280 ___ 3080 39 5.5 ___ 194 194 ___ 2134
[[left margin]] [[encircled]] 4 [[/encircled]] [[/left margin]] [[left margin]] [[encircled]] 14 [[/encircled]] [[/left margin]] More of same conglomerate [[right margin]] 16' [[/right margin]] [[left margin]] [[encircled]] 15 [[/encircled]] [[/left margin]] Thin to medium bedded calcarenite [["with" symbol]] silicious fragments Brown & grey. [[right margin]] 27.5' [[/right margin]] [[left margin]] [[encircled]] 16 [[/encircled]] [[/left margin]] Brown finely laminated calc. siltstone [["with" symbol]] some reddish chert. At 82.5' level 2' bed of grey ls. Another 2' lime bed at 132' level. 5' [[lens?]] of grey lime at the 213' level. Top 33' is a soft grey shale. [[right margin]] 308' [[/right margin]] [[left margin]] [[encircled]] 17 [[/encircled]] [[/left margin]] Red, tan, grey boulder lime conglomerate [["with" symbol]] much chert. Looks like a bioherm. Color is strikingly different from below. Forms a cap on the top [[knob?]] Numerous solitary corals. [[underline]] Enteletes [[/underline]]. Some branching corals of Syringopora type. Large [[orthotetid?]] - possibly [[underline]] Meekella [[/underline]] [[right margin]] 5.5' [[/right margin]] This is top of Hill #5300 [[?]] [["with" symbol]] dendritic [[scar &?]] [[lophidium?]] - [[underline]] Edrio [[/underline]] or [[underline]] Echiosteges [[/underline]]. Large spines evenly spaced over VV.
[[circled]] 5 [[/circled]] Windmill Hill April 22, 1963 SE of Windmills - chert conglomerate = C chert pebbles in chert matrix. Below chert on East side of Windmill Hill Grey arenaceous limestone or calcarenite Thickness 10' - 20'. Also caps small rise NE of Windmill Hill. Green & brown siltstone below the lime. Trace brown conglomerate around main hill Rock above brown congl. is tan & grey massive conglomeratic limestone [["with" symbol]] ls. cobbles & scattered chert pebbles & big crinoid stems. Typical Skinner Ranch fm. 20 levels is top of slip block at WMH 275' to base of ledge (conglomerate) ledge 49.5' thick The Intervening shale is 55' thick Is actually a covered slope. Base of upper ledge is 5' thick bed [["with" symbol]] crinoid stems
[[circled]] 6 [[/circled]] Cosenophora[[guess]] in upper ledge 33' to base of upper ledge next Hill to Northeast. (Middle Hill) On hill 5021, west side, ledges one level apart. The lower ledge disappeared shortly NE of middle hill. The lower ledge in NE hill ± this lower ledge (Carter says no!) Lower ledge in NE hill is about 100' long then it disappears also. Little knob at NE end of ridge entering 5021. At base is about 20' of Lennox Hills fm. (coarse congl.), top is Decie Ranch ls congl. [["with" symbol]] crinoid stems. Lennox Hills congl. is about 50' thick on NE side of tit at end of ridge 5021. Same congl. is only 17 thick on SW side. Base of hill that projects East from 5021 above 4500 contour is coarse grained ss. [["with" symbol]] normal dip. Top of hill covered by rubble from
5.5 17 ____ 385 55 ____ 93.5
[[encircled]] 7 [[/encircled]] Skinner Ranch fm. Note: The lower ledge in middle hill seems to simply quit. The apparent double ledge previously noted is probably simply a ramification of greater thickness of upper ledge & or the aspect seen due to Ving back down dip in the hill. [[left margin]] 4-23-1 [[/left margin]] Measured from bed containing Neospirifer, Orthotichia?, Meekella or Geyerella, Hustedia, Rhipidomella, large Wellerella, Meekella, large crinoid columnals, small solitary corals & Heliospongia. Covered slope 93.5' Thin bedded (6 - 8") of dark grey calcarenite [["with" symbol]] rusty chert on bedding planes up to 2" thick [["with" symbol]] intercalated brown platy siltstone Covered slope 11' Base of cliff composed of brown conglomerate, chert pebble & ls. boulders. [[underlined]] Leptodus [[/underlined]], 82.5'
[[circled]] 8 [[/circled]] Dark grey ls. 6" beds [["with" symbol]] chert layers Orthotichia, Reticulorina[[reticulina]]?, Striatifera?, Hustedia, richthofenid of some sort, [[margin]] 4-23-2 [[/margin]] Back slope of Hill 5300 at East end. Fossiles: Meekella, large crinoid columnals, Geyerella, Orthotichia?, Rhipidomella, Sullivan Peak mem. Grey calcarenite [["with" symbol]] chert bands on bedding planes Spyridiophora, Leptotid of some sort, Hustedia
[[circled]]9[[/circled]] Hill N of Hess Ranch April 24, 1963 [[circled]] 1 [[/circled]] Wolfcamp conglomemse at base of Hill 71.5' [[circled]] 2 [[/circled]] Covpred slope to top of hill at extreme west end of 4-24-1 63' Isolated strike & dip on east part of hill North of Hess Ranch House Dip direction is N20E Dip 5[[degree symbol]] Strike N70W Strike N45E East of last shot Did 15[[degree symbol]] N
4.98 26 ----- 2988 996 ------ 129.48 5.5 80 ------ 440.0
10 Hill 5305 4-24-2 April 24, 1963 Hess Ranch Horst measured from road 1 Covered slope 22' 2 Limestone congl c chart pebbles and lime cobbles, massivelly bedded, rounded weathered surfaces tan weathered color fresh color grey. Section measured flsny[?] cairn 11' to base of cairn Anomalies dips,massive initial cross-bedding? Cap dolomitized from 77 units up to top 440' 3 More of same as 2 dip just a guess [[arrow]] 30' + impossible to determine On back of slope of hill. 4[arrow] dip on back of slope ca. 30* 26 levels at 25* across back spur heading N25*W{ca doomdip} ca.130' more above unit 3 congli + dolomitized congli in calcomanite matrix, massive X beds with many odd dips top beds of back slope coarse dark dolomite another dip + st.d=25*N, st.=N60*E
[[circled]] 11 [[/circled]] 75' along back spur (25[[degree symbol]] dip) to level of fossil hash leptodus neophricodothyris big Dorbyia? 95' (25[[degree symbol]] dip) to base of shale at base of knob Top ls bed has Hustodin, Attiplecus, Neospir. Rhip. on skin of silicification 50' yellow shale w/thin silty ls layers 20' massive tan bioherm cap to knob 85' Dolomite cap to back slope huge crin cols on topmost bed pls.
5.3 7 ---- 37.1 5.3 32 ----- 106 159 ------ 170
[[circled]] 12 [[/circled]] Exotic Block on L. M. 4-25-63 We will measure the main exotic block starting from the upper coarse brown conglomerate. This same congl. occurs in 3 serarate beds in the low hill adjoining ours to the East. Here the 3 beds are separated by platy siltstones or sandstones. Since those congls. are possibly not in place in relation to the main exotic block, we are starting [['with' symbol]] the top of a similar congl. as a datum in the main block. Top of saddle is start. [[circled]] 1 [[/circled]] Top of brown coarse congl. composed of large ls. cobbles, very poorly sorted. Shaly slope. REG using Brunton set of 15[[degree symbol]] dip. 53' [[circled]] 2 [[/circled]] Grey & brown congl. [['with' symbol]] smaller cobbles and pebbles. Crinoid stems, [[strikethrough]] only [[/strikethrough]] ls. pebbles mainly, little chert. 5.3' [[circled]] 3 [[/circled]] Covered slope 170' Covered [['with' symbol]] brown-grey conglomente (Assume congl. underneath?) [[circled]] 4 [[/circled]] Grey to tan coarsely xlline ls. 37' to base of huge congl boulders Grey on fresh, tan on weathered thinly laminated, 6"-2' beds.
45 17 --- 315 45 ---- 765 45 25 --- 225 90 ---- 1125 4.5 32 ---- 90 135 ---- 144 4.5 5 --- 22.5 4.5 13 ----- 135 45 ----- 585 4.5 9 ----- 40.5 4.5 6 ----- 270
[[circled]] 13 [[/circled]] WC cgl. [[circled]] 5 [[/circled]] Now using 35[[degree symbol]] dip. Base of huge congl. boulders. Congl. tan & grey composed mainly of grey ls. cobbles and pebbles, some rusty chert pebbles. Very massively bedded. Some boulders appear to be quite cherty, others almost completely ls. boulders of considerable size. 144' [[circled]] 6 [[/circled]] Coarsely Xlline calcarenite 22.5' [[circled]] 7 [[/circled]] Like on Windmill Hill - typical chert pebble congl. 1' [[circled]] 8 [[/circled]] Coarsely xlline ls. 40.5' [[circled]] 9 [[/circled]] Lime pebble congl. 3/6 4.5' [[circled]] 10 [[/circled]] Covered slope 27' [[circled]] 11 [[/circled]] Coarsely xlline calarenite massive bedded 76.5' ------ Top of WC [[circled]] 12 [[/circled]] Apparently same but darker brown - looks dolomitized Level 14 is top of hill. Continued to base at Leonard Mtn. 112.5' [[circled]] 13 [[/circled]] Cover 58.5'
45 9 --- 405
[[circled]] 14 [[/circled]] [[circled]] 14 [[/circled]] Coarsely xlline tan calcarenite deeply weathered. 40.5' Swale at base of mountain. Rubble slope on Leonard Mtn. contains boulders of congl. similar to those found on exotic block.