Nopah Formation, Sample 2295-CO, Member A (Cambrian of the United States)

Where: Nevada (39.0° N, 116.0° W: paleocoordinates 3.2° S, 88.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Dunderbergia trilobite zone, Dunderberg Shale A Member (Nopah Formation), Steptoean (501.0 - 485.4 Ma)

• Listed as upper half of Dunderbergia zone

• group of beds-level stratigraphic resolution

Environment/lithology: slope; poorly lithified shale and lithified, shelly/skeletal limestone

• Fossils only in limestones
• Dominantly shale interbedded with fossiliferous limestone

Size classes: macrofossils, mesofossils

Primary reference: A. R. Palmer. 1960. Trilobites of the Upper Cambrian Dunderberg Shale, Eureka District, Nevada. United States Geological Survey Professional Paper 334-C:53-107 [P. Novack-Gottshall/P. Hearn/M. Hopkins]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 75269: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 03.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• Upper half of Dunderbergia zone age; Trilobite systematics with some phosphatic inarticulates mentioned; however, this is probably an accurate portrayal of full fauna
Trilobita indet. Walch 1771 trilobite
 Ptychopariida - Elviniidae
Dunderbergia bigranulosa Palmer 1960 trilobite
 Olenida - Pterocephaliidae
Cernuolimbus orygmatos Palmer 1960 trilobite
 Olenida - Olenidae
Olenus wilsoni trilobite
 Agnostida - Diplagnostidae
Pseudagnostus communis Hall and Whitfield 1877
 Agnostida - Agnostidae