USGS Coll. 184-CO (Cambrian of the United States)

Where: Llano County, Texas (30.6° N, 98.5° W: paleocoordinates 16.4° S, 98.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Aphelaspis trilobite zone, Riley Formation, Paibian (497.0 - 494.0 Ma)

• could be either Lion Mountain or upper Cap Mountain members

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified limestone

• either from upper limy portion of Cap Mountain member or calcareous lenses in Lion Mountain member

Size class: macrofossils

Collected by Bridge, Lochman in 1934

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 208990: 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
Lingulata
 Acrotretida - Acrotretidae
Angulotreta triangularis
Trilobita
 Olenida - Aphelaspidae
Aphelaspis walcotti
Aphelaspis walcotti Resser 1938 trilobite