Where: San Saba County, Texas (31.2° N, 99.0° W: paleocoordinates 22.6° S, 47.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Chappel Limestone Formation, Ivorian (353.8 - 346.7 Ma)

• Chappel Limestone is a condensed one-meter thick unit spanning the S. isostichia-crenulata through Gnathodus typicus to the S. anchoralis-latus zones (upper Kinderhookian through Osagean).

• bed-level stratigraphic resolution

Environment/lithology: basinal (); lithified limestone

Size class: macrofossils

Reposited in the USNM

Primary reference: D. K. Brezinski. 1998. Trilobites from the Lower Mississippian starved basin facies of the southern United States. Journal of Paleontology 72(4):718-725 [J. Alroy/M. Sommers/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 1: authorized by John Alroy, entered by Mike Sommers on 20.11.1998, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)