Dunderberg Shale. Nopah Formation; Ruby Range, Eureka, McGill (all NV), and Fish Springs (UT) (Cambrian of the United States)

Where: Nevada and Utah (40.0° N, 115.0° W: paleocoordinates 3.9° S, 87.4° W)

When: Dunderberg Shale Member (Nopah Formation), Steptoean (497.0 - 493.5 Ma)

• Lower and middle Dunderbergia zone age (probably members A and B); Primarily trilobites listed; 20 samples from several Great Basin localities

Environment/lithology: offshore shelf; lithified, calcareous wackestone

• Lime wackestones and packstones

Size classes: macrofossils, mesofossils

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: biostratigraphic analysis

PaleoDB collection 74910: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 05.09.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

 Acrotretida -
 Lingulida -
Lingulida indet. Waagen 1885
 Pelagiellida - Pelagiellidae
Pelagiella sp. Matthew 1895
 Agnostida - Diplagnostidae
Pseudagnostus communis Hall and Whitfield 1877
 Agnostida - Agnostidae
Homagnostus sp. Howell 1935
 Ptychopariida - Phylacteridae
Aphelotoxon sp. Palmer 1965 trilobite
 Ptychopariida - Elviniidae
Dunderbergia polybothra Palmer 1960 trilobite
Dunderbergia bigranulosa Palmer 1960 trilobite
Dytremacephalus asperaxis Palmer 1965 trilobite
Dytremacephalus granulosus Palmer 1954 trilobite
 Corynexochida - Cheilocephalidae
Cheilocephalus brachyops Palmer 1965 trilobite
 Olenida - Olenidae
"Simulolenus wilsoni" = Olenus
"Simulolenus wilsoni" = Olenus trilobite
 Olenida - Aphelaspidae
Erixanium sp. Opik 1963 trilobite
 Olenida - Pterocephaliidae
Prehousia diverta Palmer 1965 trilobite
Cernuolimbus granulosus Palmer 1965 trilobite
Pterocephalia punctata Palmer 1965 trilobite
Pterocephalia concava Palmer 1960 trilobite