S-105 (Cambrian of the United States)

Where: Mason County, Texas (30.8° N, 99.4° W: paleocoordinates 15.9° S, 98.0° 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, fine-grained, red, yellow sandstone and lithified, coarse-grained, 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 1947-48; 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 208733: authorized by Melanie Hopkins, entered by Melanie Hopkins on 09.04.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

 Agnostida - Agnostidae
"Kormagnostus simplex" = Kormagnostus seclusus
"Kormagnostus simplex" = Kormagnostus seclusus Walcott 1884
 Olenida - Cedariidae
Cedaria eurycheilos n. sp. Palmer 1954 trilobite