UCMP D-5617, 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)

• 200' (61 m) below top of Pequop Fm

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, bioturbated, pebbly, shelly/skeletal limestone and lithified sandstone

• The enclosing rocks are composed of fine-grained mudstone or siltstone to coarse sandstone, and from wackestone to packstone. Occurrences on the west side of the seaway tend to be in limestones and sandstones and occasionaly in coarse pebble-bearing sediment, whereas occurrences on the east side of the seaway tend to be in finer-grained sediments with large clasts consisting entirely of shell material.

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 11962: authorized by Tom Olszewski, entered by Melissa Gibson on 22.09.2001, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• Also included in the list are 20 ramose form bryozoans, 5 fenestellid form bryozoans, 1 ostracod, and one crinoid.
Show authors, comments, and common names
unclassified
  -
Dactyletes sp.
Sedentaria
 Sabellida - Serpulidae
Spirorbis sp.
Spirorbis sp. Daudin 1800
Strophomenata
 Productida - Productidae
"Squamaria ivesi" = Peniculauris ivesi
"Squamaria ivesi" = Peniculauris ivesi Newberry 1861
Rhynchonellata
 Athyridida - Athyrididae
Composita sp.
Composita sp. Brown 1849
 Rhynchonellida - Pontisiidae
? Pontisia sp.
? Pontisia sp. Cooper and Grant 1969
Assumed to be same as Wellerella sp. in Yancey & Stevens, 1981
 Terebratulida - Dielasmatidae
Dielasma phosphoriensis
Scaphopoda
 Dentaliida - Prodentaliidae
Prodentalium sp.
Prodentalium sp. Young 1942 tusk shell
Bivalvia
 Pectinida - Limipectinidae
Acanthopecten sp.
Acanthopecten sp. Girty 1903 scallop
 Pectinida - Pseudomonotidae
Pseudomonotis sp.
Pseudomonotis sp. von Beyrich 1862 scallop
 Ostreida - Pinnidae
Meekopinna sagitta
Meekopinna sagitta Chronic 1952 oyster