UCMP D-5550, Murry Summit (Permian of the United States)

Where: Nevada (39.2° N, 115.0° W: paleocoordinates 13.8° N, 36.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Loray Formation, Kungurian (279.3 - 272.3 Ma)

• 240' (73 m) above base of Loray 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 10647: authorized by Tom Olszewski, entered by Melissa Gibson on 08.06.2001, edited by Matthew Clapham and Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• Also included in the list are: 4 fenestellid bryozoa forms, 115 undetermined mollusc individuals, and one echinoid.
Show authors, comments, and common names
Bivalvia
 Nuculida - Nuculidae
Nuculavus sp.2
Nuculavus sp.2 Tschernyschev 1943 nut clam
 Nuculanida - Polidevciidae
Polidevcia sp.2
Polidevcia sp.2 Tschernyschev 1943 clam
 Arcida - Parallelodontidae
Grammatodon (Cosmetodon) politus
Grammatodon (Cosmetodon) politus Girty 1909 clam
Assumed to be same as Parallelodon sp. in Yancey & Stevens, 1981
 Ostreida - Bakevelliidae
Bakevellia sp.2
Bakevellia sp.2 King 1848 oyster
 Pectinida - Streblochondriidae
Streblochondria sp.2
Streblochondria sp.2 Newell 1938 scallop
 Pectinida - Limipectinidae
Acanthopecten sp.2
Acanthopecten sp.2 Girty 1903 scallop
 Pectinida - Pseudomonotidae
Pseudomonotis sp.2
Pseudomonotis sp.2 von Beyrich 1862 scallop
 Cardiida - Kalenteridae
Permophorus sp.2
Permophorus sp.2 Chavan 1954 clam
 Carditida - Astartidae
Astartella sp.2
Astartella sp.2 Hall 1858 clam
Cephalopoda
 Nautilida - Tainoceratidae
Metacoceras sp.2
Metacoceras sp.2 Hyatt 1883
Scaphopoda
 Dentaliida - Prodentaliidae
Prodentalium sp.2
Prodentalium sp.2 Young 1942 tusk shell
Gastropoda
 Neritoidea - Naticopsidae
Naticopsis sp.2
Naticopsis sp.2 M'Coy 1844 snail
 Trochoidea - Araeonematidae
Yunnania sp.2
Yunnania sp.2 Mansuy 1912 snail
 Caenogastropoda - Meekospiridae
Meekospira sp.2
Meekospira sp.2 Ulrich and Scofield 1897 snail
 Cerithimorpha - Orthonemidae
"Paleostylus sp." = Palaeostylus2
"Paleostylus sp." = Palaeostylus2 Mansuy 1914 snail
 Caenogastropoda - Goniasmatidae
Goniasma sp.2
Goniasma sp.2 Tomlin 1930 snail
 Bellerophontida -
Bellerophontoidea indet.1
Bellerophontoidea indet.1 M'Coy 1851 snail
 Euomphalina - Euomphalidae
Amphiscapha sp.2
Amphiscapha sp.2 Knight 1942 snail
 Euomphalina - Microdomatidae
Glyptospira sp.2
Glyptospira sp.2 Chronic 1952 snail
 Euomphalina - Anomphalidae
Anomphalus sp.2
Anomphalus sp.2 Meek and Worthen 1866 snail
 Murchisoniina - Lophospiridae
Platyworthenia sp.2
Platyworthenia sp.2 Chronic 1952 snail
 Murchisoniina - Gosseletinidae
Apachella sp.2, Glabrocingulum sp.2
Apachella sp.2 Winters 1956 snail
Glabrocingulum sp.2 Thomas 1940 snail
Rhynchonellata
 Orthida - Rhipidomellidae
Rhipidomella sp.2
 Spiriferida - Eudoxinidae
Wilberrya fragilis
Wilberrya fragilis Yancey 1978
 Athyridida - Athyrididae
Composita sp.2
Composita sp.2 Brown 1849
Strophomenata
 Productida - Productidae
Squamaria sp.2
 Productida - Aulostegidae
Costellarina sp.2
Costellarina sp.2 Cooper and Muir-Wood 1967
Trilobita
 Proetida - Phillipsiidae
Anisopyge sp.2
Anisopyge sp.2 Girty 1909 trilobite
1Wagner 2023; 2Yancey and Stevens 1981