D 340m CO (Ordovician of the United States)

Also known as SF 622

Where: Eureka County, Nevada (39.2° N, 116.3° W: paleocoordinates 5.2° S, 83.1° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Pseudocybele nasuta trilobite zone, Ninemile Formation, Blackhillsian (474.9 - 470.0 Ma)

• Ibexian Zone J; Was Ninemile / lowermost Antelope Valley, but this zone is Ninemile

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified limestone

• middle shelf
• silty; thin-bedded; interbedded w/ledgy Ls

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 104556: authorized by Seth Finnegan, entered by Seth Finnegan on 07.02.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Pentamerida - Camerellidae
? Idiostrophia sp. Ulrich and Cooper 1936
 Orthida - Hesperonomiidae
Hesperonomia antelopensis Ulrich and Cooper 1936
Trilobita
  -
Trilobita indet. Walch 1771 trilobite
"Trilobite"
 Proetida - Dimeropygidae
"Ischyrotoma caudanodosa" = Dimeropygiella caudanodosa
"Ischyrotoma caudanodosa" = Dimeropygiella caudanodosa Ross 1951 trilobite
 Proetida - Hystricuridae
Psalikilus sp. Ross 1951 trilobite
 Asaphida - Asaphidae
? Isoteloides sp. Raymond 1910 trilobite
Ptyocephalus sp. Agassiz 1843 trilobite
Pterobranchia
 Graptoloidea - Dichograptidae
"Didymograptus cf. artus" = Didymograptus (Didymograptus) artus
"Didymograptus cf. artus" = Didymograptus (Didymograptus) artus Elles and Wood 1901 graptolite