Also known as 1.4 km east-southeast of Mud Spring Mountain. near the center, NW¼, sec. 30, T13S, R4W

Where: Sierra County, New Mexico (33.2° N, 107.3° W: paleocoordinates 3.1° S, 40.6° W)

• outcrop-level geographic resolution

When: Desmoinesian (312.8 - 306.0 Ma)

• The stratigraphic position of the bellerophontid-bearing shale is approximately 115 m above the base of the Pennsylvanian, and about 45 m above the level of the Atokan-Desmoinesian boundary as determined by Thompson and Kottlowski (1955). The Desmoinesian age of the shale unit was confirmed by identification of the characteristic Desmoinesian brachiopods Mesolobus sp. and Antiquatonia hermosana in a limestone immediately below the shale.

• bed-level stratigraphic resolution

Environment/lithology: marine; shale

Size classes: macrofossils, mesofossils

Primary reference: B. S. Kues. 1987. Pharkidonotus megalius, a large new gastropod species from the Middle Pennsylvanian of south-central New Mexico. Journal of Paleontology 61(6):1187-1193 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 146530: authorized by Pete Wagner, entered by Pete Wagner on 26.06.2013

Creative Commons license: CC BY (attribution)