USGS Coll. 6-CO (Cambrian of the United States)

Where: Burnet County, Texas (30.8° N, 98.4° W: paleocoordinates 16.8° S, 97.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Crepicephalus trilobite zone, Cap Mountain Member (Riley Formation), Guzhangian (500.5 - 497.0 Ma)

• local Maryvillia zone is within Laurentian Crepicephalus trilobite zone

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, fine-grained, medium, glauconitic limestone

• brown to gray, fine to medium granular, glauconitic and occasionally oolitic sandy or silty limestone [fossils found in upper limy portion]

Size class: macrofossils

Collected by Dake, Bridge, Ulrich in 1930-1934; reposited in the USGS

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 208984: authorized by Melanie Hopkins, entered by Melanie Hopkins on 20.04.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Ptychopariida - Tricrepicephalidae
Tricrepicephalus coria, Tricrepicephalus sp.
Tricrepicephalus sp. Kobayashi 1935 trilobite
 Ptychopariida - Crepicephalidae
"Maryvillia cf. ariston" = Coosina ariston, Coosia cf. albertensis
"Maryvillia cf. ariston" = Coosina ariston Walcott 1916 trilobite