Shell Oil Co., #32-33B. 10214'. 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; light gray, medium- to coarse-grained limestone matrix, widely scattered small glauconite grains, crinoid stems and brachiopod shells common; large scattered pebbles of dense dark gray limestone with patches of glauconite, pyrite and chalcopyrite, outline irregular as if it were originally a soft lime ooze; conglomerate intercalatedc with lenses and patches of same dense dark gray limestone and with some patches of gray silty limestones.

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 69027: 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
Eocrinoidea
  -
"Eocrinoidea" indet.
Pterobranchia
 Dendroidea - Acanthograptidae
Dictyonema "sp. undet. 1"
Dictyonema "sp. undet. 1" Hall 1851 graptolite
Lingulata
 Lingulida - Obolidae
Lingulella ibicus
Lingulella ibicus Walcott 1924
 Acrotretida - Acrotretidae
Acrotreta cf. attica
Rhynchonellata
 Orthida - Plectorthidae
Nanorthis putilla
Nanorthis putilla Walcott 1924
 Orthida - Eoorthidae
Apheoorthis ocha
Apheoorthis ocha Walcott 1924
 Pentamerida - Tetralobulidae
Punctolira punctolira
Punctolira punctolira Ulrich and Cooper 1938
 Pentamerida - Clarkellidae
Syntrophina nana
Trilobita
 Corynexochida - Leiostegiidae
"Lloydia (Leiostegium) cf. manitouensis" = Leiostegium manitouensis
"Lloydia (Leiostegium) cf. manitouensis" = Leiostegium manitouensis Walcott 1925 trilobite