Where: Texas (30.7° N, 99.3° W: paleocoordinates 9.6° S, 37.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Smithwick Formation, Moscovian (315.2 - 307.0 Ma)

• In the Llano region, the age of the Smithwick Formation decreases from east to west (Groves 1991; Erlich and Coleman 2005). Mason is west of Bend, so this tooth is somewhat younger than the one reported by Cummins from the vicinity of Bend. The Mason locality is close to the Zesch Ranch Section (Groves 1991). A chart of fusulinid ranges, fusulinid biozones and lithostratigraphic units (Groves 1991, Figure 3) indicates that the Smithwick Formation at Zesch Ranch is upper Atokan.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified siliciclastic sediments

Size class: macrofossils

Reposited in the TMM

• The label states that this specimen was "taken from old collections of Geological Survey of Texas". An older label has a specimen number 40129-12 that indicates that it was in a group of fossils that was transferred to the TMM from the Texas Bureau of Economic Geology.

Primary reference: W. M. Itano, K. J. Houck, and M. G. Lockley. 2012. Systematics and occurrences of Edestus (Chondrichthyes) worldwide and new occurrences from Colorado and Texas. Historical Biology 24:397-410 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 131885: authorized by Matthew Clapham, entered by Matthew Clapham on 01.08.2012

Creative Commons license: CC BY (attribution)