Beaver Dam Mountains BD-A-7 (Triassic of the United States)

Where: Utah (37.0° N, 113.7° W: paleocoordinates 8.0° N, 39.5° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Virgin Formation, Spathian (251.3 - 247.2 Ma)

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified, massive, sandy limestone

• The amalgamated character of these massive limestone beds and the concentration of comparably large sponge fragments at the base of this interval suggest that these beds were deposited under storm influence in the lower shoreface zone.
• Massive, silty and sandy limestone

Size class: macrofossils

Preservation: mold/impression

Collected by R. Hofmann, M. Wasmer in 2009, 2010

Primary reference: R. Hofmann, M. Hautmann, M. Wasmer and H. Bucher. 2013. Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery. Acta Palaeontologica Polonica 58:149-173 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 122198: authorized by Matthew Clapham, entered by Matthew Clapham on 19.12.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Hexactinellida
 Lyssacinosa - Euplectellidae
Cypellospongia "sp. A" Rigby and Gosney 1983 glass sponge
Gastropoda
  -
Gastropoda "indet. A" Cuvier 1795 snail
Bivalvia
 Myalinida - Myalinidae
Promyalina putiatinensis Kiparisova 1938 clam
"Myalinella "sp. A"" = Myalina (Myalinella) Newell 1942 clam
 Pectinida - Aviculopectinidae
Eumorphotis ericius Hautmann et al. 2013 scallop
Eumorphotis cf. venetiana Hauer 1850 scallop
Eumorphotis cf. multiformis Bittner 1899 scallop
 Pectinida - Hunanopectinidae
Leptochondria nuetzeli Hautmann et al. 2013 scallop
 Pectinida - Entoliidae
Pernopecten "sp. A" Winchell 1865 scallop
 Ostreida - Bakevelliidae
Bakevellia costata Schlotheim 1820 oyster
 Cardiida - Anthracosiidae
Unionites canalensis Catullo 1847 clam
Unionites fassaensis Wissmann 1841 clam
 Trigoniida - Trigonodidae
Trigonodus cf. orientalis Bittner 1899 clam
Rhynchonellata
 Rhynchonellida - Norellidae
 Terebratulida - Gusarellidae
Protogusarella smithi Perry and Chatterton 1979
Crinoidea
 Holocrinida - Holocrinidae
Holocrinus smithi Clark and Twitchell 1915 Sea lily
Echinoidea
 Cidaroida - Miocidaridae
Miocidaris utahensis pencil urchin