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Otis Chalk Quarry 1, SMU 122, TMM 31025 (Triassic of the United States)

Also known as Trilophosaurus Quarry 1, NMMNH L-860

Where: Howard County, Texas (32.2° N, 101.2° W: paleocoordinates 6.9° N, 41.5° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Colorado City Formation (Dockum Group), Norian (221.5 - 205.6 Ma)

• variously referred to the Iatan or Colorado City of the Dockum Group; low in formation; lower level than Quarry 1

• bed-level stratigraphic resolution

Environment/lithology: crevasse splay; concretionary, green, red, yellow, blue mudstone and paleosol/pedogenic, calcareous mudstone

• "an overbank or crevasse splay deposit...[in] a floodplain environment that experienced moderate pedogenic modification"
• "red, green, purple and yellowish smectitic mudstones with minor concretions encrusting many of the bones"

Size classes: macrofossils, mesofossils

Reposited in the NMMNH, TMM

Collection methods: bulk, quarrying, surface (float), surface (in situ), mechanical, sieve,

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 22704: authorized by Anna Behrensmeyer, entered by Anna Behrensmeyer on 29.05.2001, edited by Matthew Carrano and Richard Butler

Creative Commons license: CC BY (attribution)