Where: Nevada (37.5° N, 114.7° W: paleocoordinates 3.1° S, 94.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Pioche Shale Formation, Delamaran (513.0 - 505.0 Ma)

• The nodular-to-ribbon limesotne bed begins approximately 10.5m above the limestone ledge.

• bed-level stratigraphic resolution

Environment/lithology: lithified limestone

Preservation: replaced with silica

Primary reference: A. R. Palmer. 1999. Oak Springs Summit section, type locality for the base of the Delamaran Stage. Laurentia 99: V field conference of the Cambrian Stage Subdivision Working Group, International Subcomission on Cambrian Stratigraphy 26-28 [M. Patzkowsky/P. Borkow] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 10570: authorized by Mark Patzkowsky, entered by Phil Borkow on 23.05.2001