USNM 41923, Susan Duster Limestone Mbr, Comet Mine (Cambrian of the United States)

Also known as 41923

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

• coordinate stated in text

• outcrop-level geographic resolution

When: Susan Duster Limestone Member (Pioche Shale Formation), St Davids (509.0 - 497.0 Ma)

• From 1-2.5 m above base of the Susan Duster Limestone Mbr. Within basal Poliella denticulata Biozone. Probably correlates to Delamaran stage. Early Middle Cambrian in age.

• bed-level stratigraphic resolution

Environment/lithology: limestone

• The Susan Duster Limestone was deposited on top of an erosional surface, resulting in a sharp lower contact. The fining anhd deepening-upward nature of the Susan Duster Limestone is consistent with a trangressive systems tract deposit.
• Bedded limestone.

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 50294: authorized by Austin Hendy, entered by Austin Hendy on 11.05.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for trilobites.
Show authors, comments, and common names
Trilobita
 Ptychopariida - Ptychopariidae
Kochiella brevaspis, ? Nyella plana, Syspacephalus crassus
Kochiella brevaspis Sundberg and McCollum 2002 trilobite
? Nyella plana Sundberg and McCollum 2003 trilobite
Syspacephalus crassus Rasetti 1951 trilobite
 Corynexochida - Zacanthoididae
Fieldaspis bilobata
Fieldaspis bilobata Rasetti 1951 trilobite
 Corynexochida - Dolichometopidae
Poliella denticulata
Poliella denticulata Rasetti 1951 trilobite