USGS M533, Big Canyon (Triassic of the United States)

Where: Nevada (40.5° N, 118.1° W: paleocoordinates 11.1° N, 41.7° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: hyatti ammonoid zone, Fossil Hill Member (Prida Formation), Bithynian (247.2 - 242.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: basinal (); lithified, lenticular, gray limestone and lithified siliciclastic

• (p. 3) the Fossil Hill Member, which is dark-gray, commonly fossiliferous, lenticular limestone interbedded with calcareous mudstone, siltstone, and shale.

Size class: macrofossils

Collected by N.J. Silberling in 1956-1965; reposited in the USNM

Collection methods: surface (in situ),

Primary reference: N. J. Silberling and K. M. Nichols. 1982. Middle Triassic Molluscan Fossils of Biostratigraphic Significance from the Humboldt Range, Northwestern Nevada. Geological Survey Professional Paper 1207 [A. McGowan/A. McGowan/A. McGowan]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40754: authorized by Alistair McGowan, entered by Alistair McGowan on 30.06.2004, edited by Matthew Clapham and Christina Feng

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ceratitida - Isculitidae
Isculites tozeri n. sp. Silberling and Nichols 1982 ceratite
 Ceratitida - Gymnitidae
Gymnites perplanus Meek 1877 ceratite
 Ceratitida - Khvalynitidae
Alanites obesus n. sp. Silberling and Nichols 1982 ceratite
Alanites mulleri Silberling and Nichols 1982 ceratite
 Ceratitida - Beyrichitidae
"Semibeyrichites sp." = Kocaelia1, Hollandites congressensis1
"Semibeyrichites sp." = Kocaelia1 Fantini Sestini 1990 ceratite
Hollandites congressensis1 Bucher 1992 ceratite
 Ceratitida - Acrochordiceratidae
Acrochordiceras hatschekii2 Diener 1907 ceratite
 Ceratitida - Longobarditidae
Intornites mctaggarti McLearn 1946 ceratite
 Ceratitida - Balatonitidae
"Cuccoceras bonaevistae" = Platycuccoceras bonaevistae
"Cuccoceras bonaevistae" = Platycuccoceras bonaevistae Hyatt and Smith 1905 ceratite
 Phylloceratida - Ussuritidae
Ussurites cf. arthaberi Welter 1915 ammonite
 Nautilida - Tainoceratidae
? Aulametacoceras humboldtensis Silberling and Nichols 1982 nautiloid
 Nautilida - Grypoceratidae
Grypoceras whitneyi Gabb 1864 nautiloid