ammonites
UCMP D-5586, Confusion Range (Permian of the United States)

Where: Utah (39.4° N, 113.7° W: paleocoordinates 12.4° N, 35.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Arcturus Formation, Artinskian (290.1 - 279.5 Ma)

• 250' (76 m) below top of Arcturus Fm

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified wackestone and lithified packstone

• The enclosing rock consists of wackestone and packstone that was a sediment of mud or muddy sand, containing a small to moderate amount of clay and noncalcareous silt. The beds are separated by thin, clayey shale partings and are interbedded with noncarbonate strata. The coarse component consists of shell material that is broken, abraded, and sometimes well-rounded.

Size class: macrofossils

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

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 10651: authorized by Tom Olszewski, entered by Melissa Gibson on 08.06.2001, edited by Pete Wagner