PBDB Collection

D1576 CO, E. of Groom Mine: Whiterockian, Nevada

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Rhynchonellata - Orthida - Anomalorthidae

	Anomalorthis nevadensis Ulrich and Cooper 1938	Ross 1970

	Anomalorthis ? resoi Ross 1970	Ross 1970
	Ross
Tergomya - Tryblidiida - Tryblidiidae

	cf. Propilina indet. Kobayashi 1933
Gastropoda - Bellerophontida - Tropidodiscidae

	Groomodiscus rossi n. gen., n. sp. Rohr and Yochelson 1990		4 specimens
Gastropoda - Murchisoniina - Eotomariidae

	Trochonema (Eunema) indet. (Salter 1859)
	= ? Clathrospira ? glindmeyeri Rohr 1996	Wagner 2023
Gastropoda - Murchisoniina - Lophospiridae

	Lophospira indet. Whitfield 1886
	= Lophospira perangulata Hall 1847	Wagner 2023
Gastropoda - Euomphalina

	Macluritacea indet. (Carpenter 1861)
Gastropoda - Euomphalina - Macluritidae

	Maclurites indet. Le Sueur 1818
	= Monitorella auricula Rohr 1994	Wagner 2023

	Palliseria indet. Wilson 1924
	= Palliseria robusta Wilson 1924	Wagner 2023
Gastropoda - Euomphalina - Ophiletidae

	Euomphalacea indet. White 1877
	= Rossospira harrisae Rohr 1994	Wagner 2023
Hormogoneae - Oscillatoriales - Girvanellaceae

	Girvanella indet. Nicholson and Etheridge 1878
see common names

Period:	Ordovician
10 m.y. bin:	Ordovician 2-4
*Period:	Middle Ordovician	*Local age/stage:	Middle Whiterockian
Key time interval:	Whiterockian	Brachiopod zone:	Zone M
Age range of interval:	470 - 457 m.y. ago
* legacy (obsolete) database fields

Geological group:	Pogonip	Formation:	Antelope Valley	Member:	Anomalorthis Zone
Regional section:	Antelope Valley Formation	Regional bed:	261 m
Regional order:	top to bottom
Stratigraphic resolution:	group of beds
Stratigraphy comments: 261 m. below top of Antelope Valley Fm.; 12 m above base of a sequence of very fossiliferous, bioclastic limestone; Kanoshian (middle Whiterockian). Zone M (Anomalorthis)

Primary lithology:	"limestone"
Lithology description: Very fossiliferous bioclastic limestone with beds from 15-60 cm thick
Environment:	shallow subtidal indet.
Geology comments: "The presence of abundant pelmatozoan plates indicates normal marine salinity, and the underlying and overlying beds are oncolitic (Girvanella), suggesting shallow, higher energy conditions.

Modes of preservation:	body,replaced with silica
Size of fossils:	macrofossils,mesofossils

Collection excludes:	all microfossils,some macrofossils
Collection methods:	selective quarrying,chemical,field collection
Reason for describing collection:	taxonomic analysis
Museum repositories:	USNM
Taxonomic list comments:Gastropods only.

25411		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]
9042		P. J. Wagner. 2023. Paleozoic Gastropod, Rostroconch, Helcionelloid and Tergomyan Database (2006 - 2023). [P. Wagner/P. Wagner/P. Wagner]