Nelson River Exposure (Ordovician of Canada)

Where: Manitoba, Canada (56.6° N, 93.9° W: paleocoordinates 9.1° S, 52.9° W)

• coordinate estimated from map

When: "Upper" Member (Surprise Creek Formation), Maysvillian (450.2 - 449.6 Ma)

• "Two lithologic divisions are recognized on Nelson River (Lower Member and Upper Member). Exact correlation with members at the type section is uncertain."

•

•Was Edenian - Richmondian.

• member-level stratigraphic resolution

Environment/lithology: dolomitic, gray limestone

• Environmental call by T. Hanson.
• "At least 10 feet of conchoidally breaking, gray- to buff-weathering, light-yellowish-gray, microcrystalline, in places cryptocrystalline, dolomitic limestone. Organic detritus is rare or lacking. Lithologically it is similar to members No. 1 and 2 of the formation at the type section."

Size class: macrofossils

Primary reference: S. J. Nelson. 1963. Ordovician paleontology of the Northern Hudson Bay lowland. Geological Society of America Memoir 90:1-152 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23010: authorized by Steven Holland, entered by Tori Hanson on 08.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Strophomenata
 Strophomenida - Sowerbyellidae
"Thaerodonta spp." = Eochonetes
"Thaerodonta spp." = Eochonetes Reed 1917
 Strophomenida - Strophomenidae
Strophomena lenta
 Strophomenida - Furcitellidae
"Rafinesquina lata" = Oepikina lata, Megamyonia nitens
"Rafinesquina lata" = Oepikina lata Whiteaves 1896
Megamyonia nitens Billings 1860
Megamyonia nitens (Billings) (?)
Rhynchonellata
 Rhynchonellida - Rhynchotrematidae
"Rhynchotrema kananaskia" = Hiscobeccus kananaskia
"Rhynchotrema kananaskia" = Hiscobeccus kananaskia Wilson 1926
Rhynchotrema kananaskia Wilson (?)