UCMP loc. D-5688, Ranger Mountains (Ordovician of the United States)

Also known as Anomalorthis communities

Where: Clark County, Nevada (36.8° N, 115.9° W: paleocoordinates 7.0° S, 82.3° W)

• coordinate based on political unit

• basin-level geographic resolution

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

• "lower to mid M.Ord (whiterockian=Llanvirn)"

Environment/lithology: peritidal; fine-grained lime mudstone

• "lime mud and silt (calcareous shales and shaly ls) rich in bioclastic debris. intertidal/shallow subtidal. miogeocline stable BA1/2."

Size classes: macrofossils, mesofossils

Primary reference: R. J., J.r. Ross and H. B. Barnes. 1967. Some Middle Ordovician Brachiopods and Trilobites from the Basin Ranges, Western United States. United States Geological Survey Professional Paper 523-D:D1-D4 [S. Finnegan/S. Finnegan/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 300: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Berry, Lawson and Yancey 1979. Ross 1967 Prof. Pap. 523D"
Show authors, comments, and common names
Rhynchonellata
 Orthida - Orthidae
Orthambonites sp.
Orthambonites sp. Pander 1830
 Orthida - Anomalorthidae
Anomalorthis nevadensis
Anomalorthis nevadensis Ulrich and Cooper 1938
 Orthida - Plectorthidae
Desmorthis sp.
Desmorthis sp. Ulrich and Cooper 1936
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
Gastropoda
 Euomphalina - Macluritidae
Palliseria sp., Maclurites sp.
Palliseria sp. Wilson 1924 snail
Maclurites sp. Le Sueur 1818 snail
Bivalvia
 Solemyida - Ctenodontidae
? Ctenodonta sp.
? Ctenodonta sp. Salter 1852 clam
originally entered as "? Ctenodonta sp."
Demospongiae
 Lithistida - Anthaspidellidae
Calycocoelia sp.
Calycocoelia sp. Bassler 1927 demosponge