D 820 CO (Ordovician of the United States)

Also known as SF 84

Where: Nye County, Nevada (36.9° N, 116.7° W: paleocoordinates 6.4° S, 82.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: O? zone, Antelope Valley Formation (Pogonip Group), Whiterockian (470.0 - 457.3 Ma)

• Whiterockian

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified siltstone

• carbonate platform
• calcareous

Size class: macrofossils

Preservation: replaced with silica

Collected by J. Ross, Jr.

Collection methods: bulk,

Primary reference: R. J. Ross, Jr. and C. R. Longwell. 1964. Middle and Lower Ordovician Formations in Southernmost Nevada and Adjacent California. United States Geological Survey Bulletin 1180-C:C1-C101 [S. Finnegan/S. Finnegan/J. Marcot]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 104279: authorized by Seth Finnegan, entered by Seth Finnegan on 07.02.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Strophomenata
 Strophomenida - Sowerbyellidae
Sowerbyella cf. perplexa
 Strophomenida - Rafinesquinidae
"? Macrocoelia sp." = Colaptomena
"? Macrocoelia sp." = Colaptomena Cooper 1956
Rhynchonellata
 Orthida - Glyptorthidae
Glyptorthis sp.
Glyptorthis sp. Foerste 1914
 Atrypida - Protozygidae
? Protozyga sp.
? Protozyga sp. Hall and Clarke 1893