10434', Shell Oil Co., #32-33B, N.P. Unit, S.W. Richey field (Ordovician of the United States)

Also known as Williston Basin, Deadwood Fm., upper Tremadoc, zone d, Montana in Sepkoski 1998

Where: McCone County, Montana (47.4° N, 105.6° W: paleocoordinates 10.3° S, 75.5° W)

• coordinate based on political unit

When: Symphysurina bulbosa trilobite zone, Deadwood Formation, Gasconadian (485.4 - 477.7 Ma)

• A

• bed-level stratigraphic resolution

Environment/lithology: glauconitic, micaceous, argillaceous limestone and micaceous, green shale

• very argillaceous fine-grained, micaceous limestone filled with minute glauconite grains intercalated with lenses of green, micaceous shale, a little pyrite and graptolite fragments in shale.

Size classes: macrofossils, mesofossils

Primary reference: C. Lochman. 1964. Basal Ordovician faunas from the Williston Basin, Montana. Journal of Paleontology 38(3):453-476 [P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 232902: authorized by Pete Wagner, entered by Pete Wagner on 07.01.2024

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Lochman-Balk and Wilson 1967. biostrat. lists"
Show authors, comments, and common names
Pterobranchia
 Dendroidea - Acanthograptidae
Callograptus richeyi
 Dendroidea - Dendrograptidae
Dendrograptus hallianus
Dendrograptus hallianus Prout 1851 graptolite
  - Rhabdopleuridae
"Haplograptus montanensis" = Haplograptus wisconsinensis montanensis
"Haplograptus montanensis" = Haplograptus wisconsinensis montanensis Lochman 1964 graptolite
Haplograptus wisconsensis montanensis
Lingulata
 Lingulida - Obolidae
Lingulella cf. ibicus
Lingulella cf. ibicus Walcott 1924
Artiopoda
 Agnostida - Agnostidae
"cf. Geragnostus mundus" = Trilobagnostus mundus
"cf. Geragnostus mundus" = Trilobagnostus mundus Raymond 1925
Trilobita
 Olenida - Olenidae
"Euloma cordilleri" = Highgatella cordilleri
"Euloma cordilleri" = Highgatella cordilleri Lochman 1964 trilobite