Central Great Basin, Orr Fm., John's Wash Mbr., Dunderbergia zone, Open Shelf Co (Cambrian of the United States)

Where: Nevada (36.2° N, 115.1° W: paleocoordinates 3.9° S, 91.2° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Dunderbergia zone, John's Wash Member (Orr Formation), Dresbachian (497.0 - 485.4 Ma)

• "Dresbachian, Dunderbergia zone"

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; carbonate

• "carbonate (wackestones and packstones), ocean facing shelf, subtidal, below wavebase, BA4, miogeocline"

Size class: macrofossils

Primary reference: D. J. McBride. 1976. Outer shelf communities and trophic groups in the Upper Cambrian of the Great Basin. Brigham Young University Geology Studies 23(2):139-152 [P. Novack-Gottshall/P. Hearn/J. Ju]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 241: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "D.J.MBride, 1976. Outer Shelf communities and trophic groups in the Upper Camb. of the Great Basin. BYU Geol Studies 23(2):139-152."
Show authors, comments, and common names
Trilobita
 Ptychopariida - Phylacteridae
Aphelotoxon sp.
Aphelotoxon sp. Palmer 1965 trilobite
 Ptychopariida - Elviniidae
Dunderbergia sp., Dytremacephalus sp.
Dunderbergia sp. Walcott 1924 trilobite
Dytremacephalus sp. Palmer 1954 trilobite
 Corynexochida - Cheilocephalidae
Cheilocephalus sp.
Cheilocephalus sp. Berkey 1898 trilobite
 Olenida - Aphelaspidae
Erixanium sp.
Erixanium sp. Opik 1963 trilobite
 Olenida - Pterocephaliidae
Prehousia sp., Sigmocheilus sp., Pterocephalia sp., Cernuolimbus sp.
Prehousia sp. Palmer 1960 trilobite
Sigmocheilus sp. Palmer 1960 trilobite
Pterocephalia sp. Roemer 1849 trilobite
Cernuolimbus sp. Palmer 1960 trilobite
 Olenida - Olenidae
"Simulolenus sp." = Olenus
"Simulolenus sp." = Olenus Dalman 1827 trilobite
Artiopoda
 Agnostida - Diplagnostidae
Pseudagnostus sp.
Pseudagnostus sp. Jaekel 1909
 Agnostida - Agnostidae
Homagnostus sp.
Homagnostus sp. Howell 1935
originally entered as "Homagnosts sp."
Lingulata
 Lingulida -
Lingulida indet.
Lingulida indet. Waagen 1885
 Acrotretida -
Acrotretida indet.
Helcionelloida
 Helcionellida - Pelagiellidae
Pelagiella sp.
Pelagiella sp. Matthew 1895