Shell Oil Co., #32-33B. 10223', #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 limestone

• "sh, ls, and congl. muddy shelf lagoon (BA2) cratonic shelf"
• limestone pebble conglomerate; largely a matrix of medium- to coarse-grained gray limestone with scattered, very small glauconite grains and blebs of pyrite; some lenses and a few small pebbles of a dense gray argillaceous calcilutite; a few mall lenses of subangular quartz silt.

Size classes: macrofossils, mesofossils

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 69028: authorized by Pete Wagner, entered by Pete Wagner on 15.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Lochman-Balk and Wilson 1967. biostrat. lists"
Show authors, comments, and common names
Trilobita
 Corynexochida - Leiostegiidae
Lloydia (Leiostegium) "sp. A"
Lloydia (Leiostegium) "sp. A" Raymond 1913 trilobite
 Proetida - Hystricuridae
Glabretina andrewsi n. gen. n. sp.
Glabretina andrewsi n. gen. n. sp. trilobite
 Asaphida - Nileidae
Symphysurina sp.
Symphysurina sp. Ulrich 1924 trilobite
Lingulata
 Acrotretida - Acrotretidae
Acrotreta cf. attica
 Lingulida - Obolidae
Lingulella ibicus
Lingulella ibicus Walcott 1924
Gastropoda
 Euomphalina - Raphistomatidae
"cf. Raphistomina sinclairensis" = Ceratopea sinclairensis
"cf. Raphistomina sinclairensis" = Ceratopea sinclairensis Kobayashi 1955 snail
 Euomphalina - Ophiletidae
Lecanospira sp.
Lecanospira sp. Butts 1926 snail
Eocrinoidea
  -
"Eocrinoidea" indet.