USNM 41750, Susan Duster Limestone Mbr, Highland Range (Cambrian of the United States)

Also known as 41750

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

• From basal meter of the Susan Duster Limestone Mbr, within uppermost Amecephalus arrojosensis Biozone. Probably correlates to Delamaran stage. Early Middle Cambrian in age.

• bed-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, calcareous 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.
• Bioclastic 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 50093: 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 bilobata
Fieldaspis bilobata Rasetti 1951 trilobite
 Corynexochida - Dolichometopidae
Poliella lomataspis
Poliella lomataspis Palmer and Halley 1979 trilobite
 Ptychopariida - Alokistocaridae
Amecephalus arrojosensis
Amecephalus arrojosensis Lochman 1952 trilobite
 Ptychopariida -
Mexicella robusta
Mexicella robusta Sundberg and McCollum 2000 trilobite
 Ptychopariida - Ptychopariidae
Caborcella reducta, Nyella rara
Caborcella reducta Palmer and Halley 1979 trilobite
Nyella rara Rasetti 1951 trilobite