UCMP D-5627, High Bald Peaks, Medicine Range (Permian of the United States)

Where: Nevada (40.2° N, 115.2° W: paleocoordinates 12.9° N, 36.4° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Pequop Formation, Artinskian (290.1 - 279.3 Ma)

• 1400' (427 m) below top of Pequop Fm

• bed-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 10650: authorized by Tom Olszewski, entered by Melissa Gibson on 08.06.2001, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Also included in the list are: 10 ramose bryozoan forms, and 2 crinoid individuals.
Show authors, comments, and common names
Cephalopoda
 Nautilida - Tainoceratidae
Metacoceras sp.2
Metacoceras sp.2 Hyatt 1883
Gastropoda
 Trochoidea - Araeonematidae
Yunnania sp.2
Yunnania sp.2 Mansuy 1912 snail
 Bellerophontida -
Bellerophontoidea indet.1
Bellerophontoidea indet.1 M'Coy 1851 snail
Scaphopoda
 Dentaliida - Prodentaliidae
Prodentalium sp.2
Prodentalium sp.2 Young 1942 tusk shell
Bivalvia
 Pectinida - Pseudomonotidae
Pseudomonotis sp.2
Pseudomonotis sp.2 von Beyrich 1862 scallop
 Cardiida - Kalenteridae
Permophorus sp.2
Permophorus sp.2 Chavan 1954 clam
 Trigoniida - Schizodidae
Schizodus sp.2
Schizodus sp.2 King 1844 clam
 Nuculanida - Polidevciidae
Polidevcia sp.2
Polidevcia sp.2 Tschernyschev 1943 clam
 Nuculida - Nuculidae
Nuculavus sp.2
Nuculavus sp.2 Tschernyschev 1943 nut clam
Strophomenata
 Productida - Productidae
"Squamaria ivesi" = Peniculauris ivesi
"Squamaria ivesi" = Peniculauris ivesi Newberry 1861
Rhynchonellata
 Athyridida - Athyrididae
Composita sp.2
Composita sp.2 Brown 1849
1Wagner 2023; 2Yancey and Stevens 1981