ammonites
D 1023 CO (Ordovician of the United States)

Also known as SF 503

Where: Inyo County, Nevada (37.0° N, 118.9° W: paleocoordinates 5.1° S, 85.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: O? zone, Johnson Spring Fm. Formation, Whiterockian (471.8 - 457.5 Ma)

• Whiterockian

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified siltstone

• middle shelf
• laminated; thin-bedded; black to brown, laminated in places, shaly to flaggy parting, sand and silt near top of unit

Size class: macrofossils

Preservation: replaced with silica

Collected by J. Ross, Jr.

Collection methods: bulk,

Primary reference: J. Ross, Jr. 1964. Middle and Lower Ordovician Formations in Southernmost Nevada and Adjacent California. United States Geological Survey Bulletin 1180-C [S. Finnegan/S. Finnegan] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 104346: authorized by Seth Finnegan, entered by Seth Finnegan on 07.02.2011