10205', 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: Leiostegium-Kainella trilobite zone, Deadwood Formation, Demingian (485.4 - 478.6 Ma)

• "L. Ord. upper Tremadoc, Zone D"

• bed-level stratigraphic resolution

Environment/lithology: lagoonal; medium-grained, coarse, dolomitic, gray limestone

• "sh, ls, and congl. muddy shelf lagoon (BA2) cratonic shelf"
• limestone pebble conglomerate; light gray, medium- to coarse-grained limestone matrix with shell fragments and crinoid stems; small scattered pebbles of dark gray, densee dolomitic limestone; patches of dark shaly lenses; large scattered grains of glauconite and pyrite

Size class: macrofossils

Primary reference: C. Lochman. 1965. Lower Ordovician (Zone D) faunules from the Williston Basin, Montana. Journal of Paleontology 39(3):466-486 [P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 284: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Lochman-Balk and Wilson 1967. biostrat. lists"
Show authors, comments, and common names
Eocrinoidea
  -
Eocrinoidea indet.
Eocrinoidea indet. Jaekel 1918
Pterobranchia
 Graptoloidea - Anisograptidae
Bryograptus sp.
Bryograptus sp. graptolite
Lingulata
 Lingulida - Obolidae
Lingulella sp.
Lingulella sp. Salter 1866
 Acrotretida - Acrotretidae
Acrotreta cf. attica
Rhynchonellata
 Pentamerida - Tetralobulidae
Imbricatia sp.
 Pentamerida - Clarkellidae
cf. Syntrophina nana
 Orthida - Plectorthidae
Nanorthis putilla
Nanorthis putilla Walcott 1924
Gastropoda
 Bellerophontida - Sinuitidae
Cyrtodiscus sp.
Cyrtodiscus sp. Perner 1903 snail
 Eogastropoda - Sinuopeidae
"Rhombella cf. umbilicata" = Euconia umbilicata
"Rhombella cf. umbilicata" = Euconia umbilicata Dake and Bridge 1932 snail
 Euomphalina - Macluritidae
Macluritella aff. stantoni
Trilobita
 Corynexochida - Leiostegiidae
"Lloydia (Leiostegium) cf. manitouensis" = Leiostegium manitouensis
"Lloydia (Leiostegium) cf. manitouensis" = Leiostegium manitouensis Walcott 1925 trilobite
 Asaphida - Asaphidae
Xenostegium sp.
Xenostegium sp. Walcott 1924 trilobite