Portage Chute Formation, Member 2 (Nelson River Exposure) (Ordovician to of Canada)
Where: Manitoba, Canada (56.5° N, 94.3° W: paleocoordinates 9.1° S, 53.4° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: 2 Member (Portage Chute Formation), Edenian to Edenian (451.0 - 445.5 Ma)
• member-level stratigraphic resolution
Environment/lithology: dolomitic, gray limestone
• Environmental call by T. Hanson
• "Gray- to buff-weathering, light-gray, microcrystalline, slightly dolomitic limestone in beds 1 inch to 2 feet thick. Fragmental organic material is common. Closely-spaced, rusty-weathering, anastamosing laminae within the limestone are characteristic and in many places give the member a nodular appearance upon weathering."
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 13655: authorized by Steven Holland, entered by Tori Hanson on 16.04.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Show authors, comments, and common names
Cephalopoda | |
Westonoceras nelsonense, Winnipegoceras dowlingi, Winnipegoceras nelsonense n. sp., Winnipegoceras laticurvatum
Winnipegoceras nelsonense n. sp.
Winnipegoceras laticurvatum Whiteaves 1897 | |
Gastropoda | |
Fusispira gigantea Wilson 1938 snail | |
Hormotoma winnipegensis Whiteaves 1897 snail | |
Trochonema coxi Wilson 1938 snail | |
"Maclurites manitobensis" = Maclurina manitobensis, Maclurites altus
"Maclurites manitobensis" = Maclurina manitobensis Whiteaves 1890 snail
Maclurites altus Wilson 1931 snail | |
Anthozoa | |
Plasmopora lambei tabulate coral
Plasmopora pattersoni tabulate coral | |
Catenipora rubra, Catenipora stearni n. sp., Catenipora robusta, Manipora amicarum, Manipora irregularis, Manipora feildeni
Catenipora rubra tabulate coral
Catenipora stearni n. sp. tabulate coral
Catenipora robusta Wilson 1926 tabulate coral
Manipora amicarum tabulate coral
Manipora irregularis tabulate coral
Manipora feildeni tabulate coral | |
? Saffordophyllum portagechutense n. sp. tabulate coral | |
Palaeophyllum halysitoides horn coral | |
Grewingkia robusta Whiteaves 1896 horn coral | |
Chlorophyceae | |
Receptaculites sp. Defrance 1827 |