Where: Mason County, Texas (30.5° N, 98.7° W: paleocoordinates 18.5° S, 94.8° W)

• coordinate estimated from map

When: Camaraspis trilobite zone, Wilberns Formation, Furongian (497.0 - 485.4 Ma)

• Camaraspis zone is Furongian

•Llano uplift

Environment/lithology: marine; lithified, white limestone

Size class: macrofossils

Collection methods: Fossils collected from Threadgill Creek of the Wilberns limestone; collection 42-12w.1, 25 feet above the base of the formation

Primary reference: J. L. Wilson. 1949. The trilobite fauna of the Elvina zone in the Basal Wilberns limestone of Texas. Journal of Paleontology 23(1):25-44 [M. Hopkins/S. Mahmood]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 156338: authorized by Melanie Hopkins, entered by Shaun Mahmood on 19.05.2014

Creative Commons license: CC BY (attribution)