USNM 41095, Log Cabin Mbr, Pioche Hills (Cambrian of the United States)

Also known as 41095

Where: Lincoln County, Nevada (37.9° N, 114.4° W: paleocoordinates 3.3° S, 93.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Log Cabin Member (Pioche Shale Formation), St Davids (509.0 - 497.0 Ma)

• Same stratigraphic horizon as USNM 41132. At 50 m above base of Log Cabin Member, within Poliella denticulata Biozone. Probably correlates to Delamaran stage. Early Middle Cambrian in age. The Log Cabin Member is approximately 50 m thick in the Pioche Hills.

• bed-level stratigraphic resolution

Environment/lithology: shelly/skeletal, calcareous limestone and silty mudstone

• The Log Cabin Member is part of a fourth or fifth order cycle bounded by erosional surfaces. The overall lithostratigraphic package shown by the Log Cabin Member is of a coarsening and shallowing upward succession, consistent with a highstand systems tract deposit.
• Bioclastic limestone within silty mudstone

Size class: macrofossils

Reposited in the USNM

• Described specimens are deposited in the US National Museum, Washington, D.C. No preparatory or collection methods described.

Primary reference: F. A. Sundberg and L.B. McCollum. 2003. Trilobites of the lower Middle Cambrian Poliella denticulata biozone (new) of southeastern Nevada. Journal of Paleontology 77(2):331-359 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 50111: authorized by Austin Hendy, entered by Austin Hendy on 08.05.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for trilobites.
Show authors, comments, and common names
Trilobita
 Corynexochida - Oryctocephalidae
Oryctocephalus primus
Oryctocephalus primus Walcott 1886 trilobite
 Ptychopariida - Ptychopariidae
Plagiura extensa, Kochiella augusta
Plagiura extensa Palmer and Halley 1979 trilobite
Kochiella augusta Walcott 1886 trilobite