USNM 41744, Log Cabin Mbr, Highland Range (Cambrian of the United States)

Also known as 41744

Where: Lincoln County, Nevada (37.9° N, 114.6° W: paleocoordinates 3.2° S, 93.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• From middle of Log Cabin Member, within Poliella denticulata Biozone. Probably correlates to Delamaran stage. Early Middle Cambrian in age. The Highland Range has one of the thickest and most complete sections of the Log Cabin Member. The lower 30 m consists of mudstone.

• bed-level stratigraphic resolution

Environment/lithology: marine; bioturbated, yellow, 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.
• Bioturbated, silty, dusky yellow 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 50099: authorized by Austin Hendy, entered by Austin Hendy on 06.05.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for trilobites.
Show authors, comments, and common names
Trilobita
 Corynexochida - Zacanthoididae
Fieldaspis superba
Fieldaspis superba Rasetti 1951 trilobite
 Ptychopariida - Ptychopariidae
Piochella peasleensis, Plagiura extensa, Kochiella augusta
Piochella peasleensis Sundberg and McCollum 2003 trilobite
Plagiura extensa Palmer and Halley 1979 trilobite
Kochiella augusta Walcott 1886 trilobite