TC-340 (Cambrian of the United States)

Where: Mason County, Texas (30.5° N, 99.1° W: paleocoordinates 16.2° S, 98.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Cedaria trilobite zone, Hickory Member (Riley Formation), Guzhangian (500.5 - 497.0 Ma)

• local Cedarina-Cedaria zone is within Cedaria Laurentian trilobite zone

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, medium-grained, red, yellow sandstone

• noncalcareous, nonglauconitic sandstone unit consisting of buff coarse sand at the base grading upward into buff to maroon fine sand at the top.

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 208774: authorized by Melanie Hopkins, entered by Melanie Hopkins on 10.04.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Ptychopariida - Marjumiidae
Syspacheilus dunoirensis