TC-655 (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 - Crepicephalus trilobite zone, Cap Mountain Member (Riley Formation), Guzhangian (500.5 - 497.0 Ma)

• local Coosella zone spans Cedaria and Crepicephalus Laurentian trilobite zones

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, fine-grained, medium, glauconitic, brown, gray, silty limestone and lithified 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 600 feet in Threadgill Creek section], a middle siltstone and silty limestone unit [ending at 667 feet in Threadgill Creek section], and an upper limestone unit [ending at 792 feet in Threadgill 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 208761: 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
Kinsabia variegata
  -
Kinsabia variegata
Kinsabia variegata Lochman 1940
Lingulata
 Acrotretida - Acrotretidae
Opisthotreta depressa
Trilobita
 Ptychopariida - Marjumiidae
Coosella sp.
Coosella sp. Lochman 1936 trilobite
 Ptychopariida - Crepicephalidae
Coosia connata
Coosia connata trilobite
  - Llanoaspididae
Arcuolimbus convexus n. gen. n. sp.
Arcuolimbus convexus n. gen. n. sp. Palmer 1954 trilobite