Collection 41158, Grassy Spring Mb., Pioche Shale, Nevada - Eddy and McCollum (Cambrian of the United States)

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

• outcrop-level geographic resolution

When: Albertella Biozone zone, Grassy Spring Member (Pioche Shale Formation), Solvan (510.2 - 504.5 Ma)

• bed-level stratigraphic resolution

Environment/lithology: lithified packstone

• shale

Collection methods: Only trilobites from the Albertellina aspinosa subbiozone were collected.

Primary reference: J. D. Eddy and L. B. McCollum. 1998. Early Middle Cambrian Albertella biozone trilobites of the Pioche Shale, southeastern Nevada. Journal of Paleontology 72(5):864-887 [M. Patzkowsky/P. Borkow/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 9452: authorized by Mark Patzkowsky, entered by Phil Borkow on 04.11.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Corynexochida - Zacanthoididae
Albertellina aspinosa, Ursinella major n. gen. n. sp.
Albertellina aspinosa Palmer and Halley 1979 trilobite
10 cranidia, 18 pygidia, 2 librigena, 3 hypostomes
Ursinella major n. gen. n. sp. Eddy and McCollum 1998 trilobite
1 pygidium
 Ptychopariida -
Mexicella stator, Mexicella mexicana, Mexicella granulata n. sp.
Mexicella stator Walcott 1916 trilobite
6 cranidia
Mexicella mexicana Lochman 1948 trilobite
5 cranidia
Mexicella granulata n. sp. Eddy and McCollum 1998 trilobite
4 cranidia
 Ptychopariida - Ptychopariidae
Volocephalina variosa n. sp., "Nyella granosa" = Palmerara granosa, Nyella immoderata
Volocephalina variosa n. sp. Eddy and McCollum 1998 trilobite
11 cranidia
"Nyella granosa" = Palmerara granosa Resser 1939 trilobite
3 cranidia
Nyella immoderata Palmer and Halley 1979 trilobite
5 cranidia, 1 pygidium