Robinson Summit, Unit 9 (Permian of the United States)

Where: White Pine County, Nevada (39.5° N, 115.1° W: paleocoordinates 14.1° N, 36.3° W)

• coordinate stated in text

• outcrop-level geographic resolution

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

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; sandy limestone

Size class: macrofossils

Preservation: replaced with silica

Primary reference: T. V. Mayou. 1967. Paleontology of the Permian Loray Formation in White Pine County, Nevada. Brigham Young University Research Studies, Geology Series 14:101-122 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 38828: authorized by David Bottjer, entered by Matthew Clapham on 06.05.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Ostracodes abundant, crinoid ossicles rare, "Ophiurida n. gen., n. sp" rare
Bivalvia
 Protobranchia - Manzanellidae
Manzanella sp. Girty 1909 clam
 Nuculida - Nuculidae
Nuculavus levatiformis Walcott 1884 nut clam
 Protobranchia - Nuculanidae
"Nuculana obesa" = Polidevcia obesa
"Nuculana obesa" = Polidevcia obesa White 1879 pointed nut clam
Gastropoda
 Euomphalina - Euomphalidae
Amphiscapha proxima Yochelson 1956 snail
 Prosobranchia - Meekospiridae
Meekospira sp. Ulrich and Scofield 1897 snail
 Prosobranchia - Orthonematidae
Orthonema sp. Meek and Worthen 1862 snail
 Bellerophontida - Bellerophontidae
Bellerophon deflectus Chronic 1952 snail
 Bellerophontida - Euphemitidae
"Euphemites crenulates" = Euphemites crenulatus
"Euphemites crenulates" = Euphemites crenulatus Yochelson 1960 snail
 Murchisoniina - Lophospiridae
Worthenia corrugata Chronic 1952 snail
Scaphopoda
 Dentaliida - Prodentaliidae
"Plagioglypta canna" = Prodentalium canna
"Plagioglypta canna" = Prodentalium canna White 1874 tusk shell