Field notes and maps from Glass Mountains, West Texas, 1964

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This field book documents Cooper's paleontological and geological field work in Glass Mountain, West Texas from 18-19 April 1964. Cooper includes some description of stratigraphy (some sketches with measurements included). He notes abundant sponge and fusulinids found. Locations include but are not limited to Hess Ranch, Lenox Hill, and the west side of Dugout Mountain. Alphanumeric codes in this field book may refer to localities on maps (maps are not included). Pages 0985-0990.

Date Range


Start Date

Apr 18, 1964

End Date

Apr 19, 1964

Access Information

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  • Geology
  • Paleontology


  • Lenox
  • United States
  • Texas
  • Hess Ranch
  • Glass Mountains
  • Dugout Mountain


  • 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 13

Glass Mtns. April 18 - 19 1964
[[circled]] 54 [[/circled]] 985 April 18 BW4 25 - 28 Leonard & Hess unconf. King 1oc 104 In the ravines there is one contour interval about 53' of shale from igneous contact to base of conglomerate. Shale N83[[degree symbol]]W 3[[degree symbol]]N. Ls opposite King 104 to igneous dike or fault is [elnstitella?] 731c - fusilinids near top of figure - 8 - shaped hill at N end of Hess Horst Ranch Horst. 731A -fusiinids between fault and top of elliptical knob. 731d - About 20' below cgl in Neal Ranch shale, west of fault at head of valley BW4 - to end Hess Horst, E end at fault BW5 - 0 - 6 same views of narrow hill at east end Horst of Seacchinelles at 720e C7 - to 12 - same as BW5
[[circled]] 55 [[/circled]] 986 Examined east end of Horst Basal cgl. of Lenox Hills is in contact with Neal Ranch shale at N end of valley in which igneous body exists. The shale occupies an elevation of 1 contour = 50' on west side valley but igneous body is in contact with cgl. at fault. The fault runs down west side of elliptical hill with a zone about 20' wide. A large baked zone is evident and the igneous body is in contact with the shale on the west side but tapers up to the cgl on the east. The elliptical hill is composed mostly of Hess limestone tipped up 50 - 60°. On the NE slope 80' above the road is a patch of biohermal limestone with Institella, probably overlying the Hess uncomformably as it does at King loc 104. No Institella was seen in the middle part of the elliptical hill but it appears on the south side (loc 724t) and extends some distance to the south [end page]
[[circled] 56 [/circled]] 987 April 19 as at 724r (check) In afternoon examined locality 720e and went to see Road Canyon at 726c and others. April 19 730e W side Dugout Mtn. A - Thick bedded sandy limestone with hard silicious brown skins on top. Sponges abundant Rock dark gray finely granular Small productids (Elliottella?) and mostly fragmentary specimens & bryozoa scattered on surfaces Sponges very abundant on surfaces G - Thinner bedded some rock in layers 6" - 1' mostly the former This sequence is in the upper part of the Leonard #3 [[diagram in left margin]] --------------| { 5' | ------------| g { 6' | ------------| { 15' | 730f --------------| f 5' | covered --------------| E 10" | ls --------------| D 5' | covered --------------| C 3' | --------------| B 2' | covered or thin --------------| A 730e 9' | [[/diagram in left margin]]
[[circled]] 57 [[/circled]] 988 730g Leonard #4 - Thick bedded dark gray sandy limestone with siliceous surfaces often covered with sponges and fragments of fossils. Layer is about 5' thick of 2 or three layers Overlain by cherty beds and sandstone and fine bedded ss. Ammonites common but hard to get. Sponges very abundant 730h- is a limy bed 50+ above Leonard #4. 730j Leonard ls #4- Poorly exposed on surface of hill - consists of thin bedded sandy ls & calcirudite with beds of shell breccia but with few recognizable fossils. Dark gray sandy limestone with ammonites like those below. Tom says about 15'. Many sponges in places. Small pebbles. Rock is sandy, fossils mostly badly broken.
[[circled]] 58 [[/circled]] 989 Bioherms in hill 4801 20' of limestone on top of big bioherm under 4801. A' - 1' yellow siliceous shale A - lower 10' of dark gray chunky ls. with occasional goniatites B - 3 or 4 feet biohermal ls. C - 6 or 7 " of calconite with 2" siliceous skin on top. 730K - Ammonites from 5' above large bioherm in hill 4801. 730 - [l?] Fusulinids from between bioherms, hill 3801, Decie Ranch. BW5 - to 13 Dugout Mtn and hill 4801 C7 - to 29 same Leonard #4 is lithologically and formally like the Leonard #2 & 3 limestones. Also have the same goniatites out of dark gray blockey limestones in limestone #1 in hill 4801 of the Lenox Hills. This suggests that from the Seacchinelle beds up we have essentially the same fauna. I do not have good brachiopod.
[[circled]] 59 [[/circled]] 990 collections from these beds but in all the collecting done did not turn up Institella or the characteristic higher Leonard species. The bed #5 has calcirudites or shell breccias like those below but we saw no goniatite beds like those below and it is quite easy to locate Institella or other early Cathedral Mtn. types. In afternoon visited bioherms in hill 4801 where I collected goniatites, same assemblage as in limestones #2, 3, 4. If it were not for the bioherms near the top of the 20' above the big bioherm I would think it possible that these beds represent the three ls. Thinned down and with intervening shale pinched out. This is a possible explanation but the whole sequence seems to belong to limestone #1-
49 2 1/2 _____ 22 88 _____ 110 55/38 7 6 ---- 3030 355 35 35