13291', Amerada Petrol. Corp, Herman May, Fryburg Area (Ordovician of the United States)

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

Where: Billings County, North Dakota (46.9° N, 103.3° W: paleocoordinates 12.0° S, 75.6° W)

• coordinate based on political unit

When: Deadwood Formation, Demingian (485.4 - 478.6 Ma)

• "L. Ord. upper Tremadoc, Zone D"

• bed-level stratigraphic resolution

Environment/lithology: lagoonal; fine-grained, glauconitic, phosphatic, gray limestone

• "sh, ls, and congl. muddy shelf lagoon (BA2) cratonic shelf"
• gray, fine- to coarse=grained limestone with large grains of glauconite, many brachiopod shells intercalated with lenses of green, greasy shale and laminae of phosphatized crusts of corrosion surfaces.

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 69035: 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.
Rhynchonellata
 Orthida - Plectorthidae
Nanorthis putilla
Nanorthis putilla Walcott 1924
 Pentamerida - Clarkellidae
cf. Syntrophina nana
Lingulata
 Lingulida - Obolidae
Lingulella cf. ibicus
Lingulella cf. ibicus Walcott 1924
 Siphonotretida - Siphonotretidae
Schizambon discoidea
Trilobita
 Corynexochida - Leiostegiidae
cf. Lloydia (Leiostegium) sp.
cf. Lloydia (Leiostegium) sp. Raymond 1913 trilobite