ammonites
UCMP D-5591, Central Butte Mountains (Permian of the United States)

Where: Nevada (39.6° N, 115.3° W: paleocoordinates 14.3° N, 36.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Loray Formation, Kungurian (279.5 - 272.5 Ma)

• 105' (32 m) below top of Arcturus Group.

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified lime mudstone and lithified wackestone

• The rocks containing this community are calcareous mudstone and siltstone and wackestones with a high proportion of clay and noncalcaroues silt. The community is sometimes found in coarser grained muddy sandstone and packstone. The sediments are thin bedded and sometimes laminated.

Size class: macrofossils

Collected by T. Yancey, L. Plas, M. Kaasa

• Also included is 500 ostracod (indiv.) and 1 pentacrinoid (indiv.)

Primary reference: T. E. Yancey. 1978. Brachiopods and mollusca of the Lower Permian Arcturus Group, Nevada and Utah, Part 1: brachiopods, scaphopods, rostroconchs, and bivalves. Bulletins of American Paleontology 74(303):257-367 [P. Wagner/P. Wagner/M. Clapham] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 10450: authorized by Tom Olszewski, entered by Melissa Gibson on 17.04.2001