UCMP D-5614, 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

• outcrop-level geographic resolution

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

• Top of Pequop Formation.

• group of beds-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 10654: 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: 2 ramose bryozoan forms, 2 fenestellid bryozoan forms, and 1 crinoid individual.
Show authors, comments, and common names
unclassified
  -
Dactyletes sp.2
Strophomenata
 Productida - Productidae
"Squamaria ivesi" = Peniculauris ivesi
"Squamaria ivesi" = Peniculauris ivesi Newberry 1861
Rhynchonellata
 Athyridida - Athyrididae
Composita mexicana
Gastropoda
 Bellerophontida -
Bellerophontoidea indet.1
Bellerophontoidea indet.1 M'Coy 1851 snail
 Trochoidea - Araeonematidae
Yunnania sp.2
Yunnania sp.2 Mansuy 1912 snail
 Neritoidea - Naticopsidae
Naticopsis sp.2
Naticopsis sp.2 M'Coy 1844 snail
 Caenogastropoda - Goniasmatidae
Goniasma sp.2
Goniasma sp.2 Tomlin 1930 snail
Bivalvia
 Pectinida - Pseudomonotidae
Pseudomonotis sp.2
Pseudomonotis sp.2 von Beyrich 1862 scallop
 Ostreida - Pinnidae
Aviculopinna ? peracuta
Aviculopinna ? peracuta Shumard and Swallow 1858 oyster
 Carditida - Astartidae
Astartella sp.2
Astartella sp.2 Hall 1858 clam
1Wagner 2023; 2Yancey and Stevens 1981