UO 2210, Iron Mountain, Grindstone-Twelvemile Creek area (Permian of the United States)

Where: Crook County, Oregon (44.0° N, 119.7° W: paleocoordinates 18.3° N, 38.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Coyote Butte Formation, Kungurian (279.3 - 272.3 Ma)

• Mesogondolella idahoensis and N. pequopensis suggest Kungurian age (Wardlaw et al., 1982)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; limestone

• Sandstone beds are widespread but poorly exposed in the Coyote Butte Formation, limestone lenses are olive-grey, crinoidal fusulinid limestones in lower part of formation; Purer, finer-grained, deep-olive in colour and better bedded in the upper part with rarer fusulinids and common brachiopods.

Size class: macrofossils

Primary reference: G. A. Cooper. 1957. Permian brachiopods from central Oregon. Smithsonian Miscellaneous Contributions 134(12):1-79 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40980: authorized by David Bottjer, entered by Matthew Clapham on 04.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Spiriferida - Spiriferellidae