WC-628 (Cambrian of the United States)

Where: Blanco County, Texas (30.5° N, 98.5° W: paleocoordinates 16.6° S, 98.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• local Coosella zone spans Laurentian Cedaria and Crepicephalus trilobite zones

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, fine-grained, medium, glauconitic, brown, gray, silty limestone and lithified, ooidal siltstone

• brown to gray, fine to medium granular, glauconitic and occasionally oolitic sandy or silty limestone...it can be subdivided into a lower limestone unit [ending at 586 feet in White Creek section], a middle siltstone and silty limestone unit [ending at 652 feet in White Creek section], and an upper limestone unit [ending at 773 feet in White Creek section].

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 208850: authorized by Melanie Hopkins, entered by Melanie Hopkins on 14.04.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Ptychopariida - Kingstoniidae
Kingstonia pontotocensis
 Ptychopariida - Tricrepicephalidae
Tricrepicephalus coria, Tricrepicephalus texanus, Meteoraspis metra
Meteoraspis metra Walcott 1890 trilobite
 Ptychopariida - Marjumiidae
Coosella beltensis
  - Llanoaspididae
Llanoaspis virginica
Artiopoda
 Agnostida - Diplagnostidae
? Pseudagnostus nordicus
Rhynchonellata
 Orthida - Bohemiellidae
Diraphora sp.
Lingulata
 Acrotretida - Acrotretidae
Opisthotreta depressa