Where: Sierra County, New Mexico (32.8° N, 107.3° W: paleocoordinates 7.5° S, 46.1° W)

• small collection-level geographic resolution

When: Cuchillo Negro Formation (Mud Springs Group), Carboniferous (358.9 - 298.9 Ma)

• Derry series is divided into 2 groups and 4 formations. At the type locality, the Derryan consists of alternating limestone (80 %) and shales (20%), approximately 127 feet thick, lying unconformably upon Devonian shale. Unit 20 = 5 ft.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, gray, cherty/siliceous limestone

Size classes: macrofossils, microfossils

Primary reference: J. L. Gehrig. 1958. Middle Pennsylvanian Brachiopods From the Mud Springs Mountains and Derry Hills, New Mexico. State Bureau of Mines and Mineral Resources, Memoir 3 1-24 [T. Olszewski/K. Nell]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 9857: authorized by Tom Olszewski, entered by Katrina Nell on 20.02.2001

Creative Commons license: CC BY (attribution)