Shell Oil Co. Pine Field 43-22A, 9472'-9475' (Ordovician of the United States)

Where: Wibaux County, Montana (47.2° N, 110.2° W: paleocoordinates 7.4° S, 75.6° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Hintzeia celsaora trilobite zone, Deadwood Formation, Tulean (485.4 - 471.8 Ma)

• "L. Ord.. upper Arenig"

•Zone G

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal; fine-grained, pyritic, brown limestone

• "sh, ls and congl., some ss. shelf lagoon, near shoreface. BA2. Cratonic shelf"
• intercalated medium- to fine-grained pale brown limestone and a coquina of large brachiopod shells and broken pieces of large trilobite exoskeletons; black phosphatic patches and blebs of pyrite.

Size class: macrofossils

Primary reference: C. Lochman. 1966. Lower Ordovician (Arenig) faunas from the Williston Basin, Montana and North Dakota. Journal of Paleontology 40(3):512-548 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 174362: authorized by Pete Wagner, entered by Pete Wagner on 10.11.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

 Corynexochida - Leiostegiidae
Reubenella rex Lochman 1966 trilobite
 Proetida - Bathyuridae
 Asaphida - Asaphidae
 Orthida - Plectorthidae
Nanorthis putilla Walcott 1924
very abundant
 Euomphalina - Ophiletidae
"Lecanospira (Barnesella) "sp. indet."" = Lecanospira
"Lecanospira (Barnesella) "sp. indet."" = Lecanospira Butts 1926 snail