MC-532 (Cambrian of the United States)

Where: Burnet County, Texas (30.8° N, 98.3° W: paleocoordinates 16.5° S, 98.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• bed-level stratigraphic resolution

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

• 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 419 feet in Morgan Creek section], a middle siltstone and silty limestone unit [ending at 473 feet in Morgan Creek section], and an upper limestone unit [ending at 544 feet in Morgan Creek section]

Size class: macrofossils

Collected by A. R. Palmer in the 1940s; reposited in the UNSM

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 208688: authorized by Melanie Hopkins, entered by Melanie Hopkins on 08.04.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Ptychopariida - Lonchocephalidae
"Raaschella ornata" = Glaphyraspis
"Raaschella ornata" = Glaphyraspis trilobite
 Olenida - Aphelaspidae
Aphelaspis spinosa
Aphelaspis spinosa Palmer 1954 trilobite
[Aphelaspis spinosus]