Bed 2471-CO, Nopah Formation (Cambrian of the United States)

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

• coordinate estimated from map

• small collection-level geographic resolution

When: Dunderberg Shale Member (Nopah Formation), Steptoean (501.0 - 485.4 Ma)

• Listed as Aphelaspis biozone

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified siltstone and lithified, lenticular, fine-grained, gray, silty limestone

• Siltstone with interbeds and lenses of gray, fine-grained, silty, generally laminated limestone

Size classes: macrofossils, mesofossils

Collection methods: Sample chosen at random

Primary reference: A.R. Palmer. 1962. Glyptagnostus and associated trilobites in the United States. United States Geological Survey Professional Paper 374(F):F1-F49 [P. Novack-Gottshall/P. Hearn/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 75737: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 25.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

 Acrotretida - Acrotretidae
Angulotreta sp. Palmer 1954
 Agnostida -
 Agnostida - Clavagnostidae
Aspidagnostus rugosus Palmer 1962
Originally Apsidagnostus; assumed spelling error
 Agnostida - Agnostidae
"Agnostus inexpectans" = Innitagnostus inexpectans
"Agnostus inexpectans" = Innitagnostus inexpectans Kobayashi 1938
 Olenida - Aphelaspidae
Listroa toxoura Palmer 1962 trilobite
Olenaspella regularis Palmer 1962 trilobite
Aphelaspis subditus Palmer 1962 trilobite