Also known as SF 18

Where: Nye County, Nevada (38.5° N, 116.4° W: paleocoordinates 6.1° S, 80.8° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: M-N trilobite zone, Middle Member Member (Antelope Valley Limestone Formation), Whiterockian (471.8 - 457.5 Ma)

• Whiterockian; no formal stage

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified limestone

Size class: macrofossils

Preservation: replaced with silica

Collected by J. Ross, Jr.

Collection methods: surface (float),

Primary reference: R. J. Ross, Jr. 1970. Ordovician Brachiopods, Trilobites, and Stratigraphy in Eastern and Central Nevada. United States Geological Survey Professional Paper 639 [S. Finnegan/S. Finnegan/M. Hopkins] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 104373: authorized by Seth Finnegan, entered by Seth Finnegan on 07.02.2011