Otis Chalk Quarry 2, TMM 31099 (Dockum Formation) (Triassic 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 6.9° N, 41.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Colorado City Formation (Dockum Group), Norian (228.0 - 208.5 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 Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Osteichthyes
 Temnospondyli - Metoposauridae
"Buettneria perfecta" = Koskinonodon perfectus3
"Buettneria perfecta" = Koskinonodon perfectus3 Case 1922 tetrapod
Reptilia
 Eosuchia -
Rhynchosauria indet.4, "cf. Trilophosaurus buettneri" = Trilophosaurus buettneri4, "Trilophosaurus buettneri" = Trilophosaurus buettneri2, "Malerisaurus langstoni n. sp." = Trilophosaurus buettneri1
Rhynchosauria indet.4 Osborn 1903 rhynchosaur
TMM 31099-11 partim, humerus
"cf. Trilophosaurus buettneri" = Trilophosaurus buettneri4 Case 1928 archosauromorph
TMM 31099-11 partim, radius
"Trilophosaurus buettneri" = Trilophosaurus buettneri2 Case 1928 archosauromorph
"Malerisaurus langstoni n. sp." = Trilophosaurus buettneri1 Case 1928 archosauromorph
TMM 31099-11 (holotype); Spielmann et al. (2006) restricted holotype to cranial elements only
 Pseudosuchia -
? Aetosauria indet.4 Lydekker 1889 archosaur
TMM 31099-11 partim, braincase
 Phytosauria - Parasuchidae
? Parasuchidae indet.4 Lydekker 1885 archosaur
TMM 31099-11 partim, interclavicle, pelvis