Chasm Creek Formation, Member 4 (Churchill River Exposure) (Ordovician to of Canada)
Where: Manitoba, Canada (58.2° N, 94.5° W: paleocoordinates 7.0° S, 50.7° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: 4 Member (Chasm Creek Formation), Richmondian to Richmondian (449.6 - 443.7 Ma)
• member-level stratigraphic resolution
Environment/lithology: gray dolomite
• Environmental call by T. Hanson.
• "[W]ell-bedded, light-gray-weathering, microcrystalline, highly fucoidal light-gray dolomite in layers 1-2 inches thick." Probably conformable with Member No. 3. Measured thickness 11 feet thick; estimated maximim 20 feet thick.
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 23035: 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
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