ammonites
D 812 CO (Ordovician of the United States)

Also known as SF 457

Where: Nye County, Nevada (38.3° N, 116.4° W: paleocoordinates 4.5° S, 85.6° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Hintzeia celsaora - Protopliomerella contracta trilobite zone, Goodwin Formation, Tulean (488.3 - 471.8 Ma)

• Ibexian; G?

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; lithified limestone and lithified conglomerate

• carbonate ramp, above storm wave base
• flat-pebble; grey; poorly developed silicification

Size class: macrofossils

Preservation: replaced with silica

Collected by J. Ross, Jr.

Collection methods: surface (float),

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 104343: authorized by Seth Finnegan, entered by Seth Finnegan on 07.02.2011