D1578 CO (Ordovician of the United States)

Also known as SF 73

Where: Clark County, Nevada (37.3° N, 115.8° W: paleocoordinates 6.9° S, 81.8° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Whiterockian; Rangerian

• bed-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified limestone

• carbonate platform
• medium-bedded; coarse and fine grained, girvanella, Receptaculites common

Size class: macrofossils

Preservation: replaced with silica

Collected by J. Ross, Jr.

Collection methods: bulk,

Primary reference: R. J., J.r. Ross. 1970. Ordovician Brachiopods, Trilobites, and Stratigraphy in Eastern and Central Nevada. United States Geological Survey Professional Paper 639:1-99 [S. Finnegan/S. Finnegan/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 104424: 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
Trilobita
 Corynexochida - Illaenidae
Illaenus cf. fraternus
Illaenus cf. fraternus Billings 1865 trilobite
Rhynchonellata
 Orthida - Hesperorthidae
Hesperorthis cf. matutina
 Orthida - Anomalorthidae
Anomalorthis nevadensis, Anomalorthis lonensis
Anomalorthis nevadensis Ulrich and Cooper 1938
Anomalorthis lonensis Walcott 1884
 Orthida - Plectorthidae
? Desmorthis sp.
? Desmorthis sp. Ulrich and Cooper 1936