Pogonip Group, meter 42, Zone 11, Steptoe (Ordovician of the United States)

Where: Nevada (40.8° N, 115.1° W: paleocoordinates 6.2° S, 79.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Psephosthenaspis pseudobathyurus trilobite zone, Shingle Limestone Formation (Pogonip Group), Rangerian (471.8 - 468.1 Ma)

• Woodward's Formation D. Equivalent to the Shingle Formation. Given as Whiterockian, but this part now is Rangerian. Zone L. (PJW).

• bed-level stratigraphic resolution

Environment/lithology: lithified, shelly/skeletal limestone

• cyclical alternations of massive limestones with interbedded recessive thin-bedded limestones and shales

Size class: macrofossils

Reposited in the USNM

Collection methods: bulk, mechanical,

Primary reference: R. A. Fortey and M.L. Droser. 1996. Trilobites at the base of the Middle Ordovician, western United States. Journal of Paleontology 70(1):73-991 [S. Holland/S. Holland/S. Holland]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 37485: authorized by Steven Holland, entered by Steven Holland on 15.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Phacopida - Pliomeridae
Kanoshia reticulata Fortey and Droser 1996 trilobite
 Proetida - Bathyuridae
Psephosthenaspis pseudobathyurus Ross and Barnes 1967 trilobite