TC-848 (Cambrian of the United States)

Where: Mason County, Texas (30.5° N, 99.1° W: paleocoordinates 15.9° S, 98.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Dunderbergia trilobite zone, Lion Mountain Member (Riley Formation), Paibian (497.0 - 494.0 Ma)

• "post-Aphelaspis" zone is between Aphelaspis and Elvinia zones, so equates to Dunderbergia

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, glauconitic sandstone and lithified limestone

• highly glauconitic sandstone containing in the lower part numerous tangential lenses of limestone composed essentially of trilobite remains.

Size class: macrofossils

Collected by A. R. Palmer in the 1940s; reposited in the USNM

Collection methods: mechanical,

Primary reference: A. R. Palmer. 1954. The Faunas of the Riley Formation in Central Texas. Journal of Paleontology 28(6):709-786 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 208736: authorized by Melanie Hopkins, entered by Melanie Hopkins on 09.04.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Lingulata
 Acrotretida - Acrotretidae
Apsotreta expansa
Apsotreta expansa Palmer 1954
Trilobita
 Olenida - Pterocephaliidae
Pterocephalia cf. occidens
 Olenida - Aphelaspidae
? Labiostria sigmoidalis
? Labiostria sigmoidalis Palmer 1954 trilobite