Where: Brewster County, Texas (30.0° N, 103.0° W: paleocoordinates 11.6° S, 44.7° W)

• coordinate based on nearby landmark

• hand sample-level geographic resolution

When: Tesnus Formation, Serpukhovian (330.9 - 323.2 Ma)

• The shale bed is about 200 feet thick and occurs between beds of sandstone, probably near the base of the sandstone shale sequence that makes up the greater part of the Tesnus formation. Beneath is a thick section, chiefly shale, that makes up the lower part of the formation. Brooks argued for a Pennsylvanian age but an upper Mississippian age is more likely given more recent conodont biostrat of the Tesnus Formation.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, fine-grained, concretionary, calcareous claystone

Size class: macrofossils

Preservation: mold/impression

Collected by S.S. Goldich in 1939; reposited in the USNM

Primary reference: H. K. Brooks. 1955. A crustacean from the Tesnus Formation (Pennsylvanian) of Texas. Journal of Paleontology 29(5):852-856 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 130654: authorized by Matthew Clapham, entered by Matthew Clapham on 12.07.2012

Creative Commons license: CC BY (attribution)