ammonites
Otis Chalk Quarry 2, TMM 31099 (Dockum Formation) (Triassic to of the United States)

Also known as Small Reptile Quarry, ETE Locality 1580, NMMNH L-4208, Trilophosaurus Quarry 2

Where: Howard County, Texas (32.2° N, 101.3° W: paleocoordinates 6.3° N, 41.5° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Colorado City Formation (Dockum Group), Carnian to Carnian (235.0 - 205.6 Ma)

• "continental red-bed sequence"; variously referred to the Iatan or Colorado City Members of the Dockum Group; low in Dockum Group

• bed-level stratigraphic resolution

Environment/lithology: crevasse splay; red, silty mudstone and lenticular, conglomeratic sandstone

• "continental red-bed sequence accumulated in a mosaic of fluvial, lacustrine, and flood plain deposits"
• "dominant lithology is red mudstone intercalated with lenses of fine-grained sandstones and conglomerates."

Size class: macrofossils

Reposited in the NMMNH, TMM

Collection methods: quarrying, chemical, mechanical,

• ETE Size: .; ETE reference list: 1003, 770, 673, 793, 786, 772, 794, 801, 769, 771, 828, 827, 842, 857, 715, 723, 668, 773, 751, 753, 754, 891, 758, 719, 714, 728, 755, 718, 800, 799, ; ETE museum list:

Primary reference: H. J. Sawin. 1944. Amphibians from the Dockum Triassic of Howard County, Texas. Contributions to Geology, The University of Texas 4401:361-399 [M. Carrano/M. Carrano] more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 12942: authorized by John Alroy, entered by Robin Whatley on 11.01.2002, edited by Richard Butler and Matt Carrano

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)