Bed 2479-CO, Duck Creek Range [Dunderberg Shale, Nopah Formation] (Cambrian of the United States)

Where: Nevada (39.0° N, 115.0° W: paleocoordinates 3.9° S, 88.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Crepicephalus trilobite zone, Dunderberg Shale Member (Nopah Formation), Dresbachian (497.0 - 485.4 Ma)

• Listed as Crepicephalus biozone

• formation-level stratigraphic resolution

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

• Siltstone with interbeds and lenses of gray, fine-grained, silty, generally laminated limestone, nodular limestone, and a few beds of crinkly 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 75742: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 25.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Artiopoda
 Agnostida -
Glyptagnostus reticulatus Angelin 1851
"angelini"
Trilobita
 Olenida - Aphelaspidae
Aphelaspis brachyphasis Palmer 1962 trilobite
"Olenaspella separata" = Eugonocare (Olenaspella) separatum Palmer 1962 trilobite
Lingulata
 Acrotretida - Acrotretidae
Opisthotreta sp. Palmer 1954