USNM 41753, Log Cabin Mbr, Highland Range (Cambrian of the United States)

Also known as 41753

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 upper part of Log Cabin Member, within upper 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. Upper 23 m of member comprises bioclastic limestone with silty mudstone.

• bed-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, calcareous limestone and bioturbated, 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.
• From bioclastic limestone within bioturbated, 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 50100: 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
 Ptychopariida -
Kochaspis liliana, Hadrocephalites rhytidodes
Kochaspis liliana Walcott 1886 trilobite
Hadrocephalites rhytidodes Sundberg and McCollum 2002 trilobite
 Ptychopariida - Ptychopariidae
Kochiella augusta, Plagiura extensa
Kochiella augusta Walcott 1886 trilobite
Plagiura extensa Palmer and Halley 1979 trilobite
 Corynexochida - Zacanthoididae
Stephenaspis highlandensis
Stephenaspis highlandensis Sundberg and McCollum 2003 trilobite