Chaumont Formation

Geology

Group: Black River

Members: unnamed (4)

Lithologies: lime mudstone (2), wackestone (1), "limestone" (1), "carbonate" (1)

Paleoenvironments: marine indet. (1), carbonate indet. (1), shallow subtidal indet. (1), deep subtidal shelf (1)

Age range: base of the Middle Ordovician to the top of the Turinian or 470.00000 to 453.80000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Middle Ordovician470.0 - 458.4USA (New York) (23122)
Turinian457.3 - 453.8Canada (Quebec) (174157)
Turinian457.3 - 453.8USA (New York) (89098 172566 172567)
Turinian457.3 - 453.8Canada (Ontario) (185460 185429 185431 185449 185451 185462 185465 185474 185475 185476)
Blackriveran457.3 - 449.6Canada (Quebec) (63816)
Blackriveran457.3 - 449.6Canada (Ontario) (55999)
Blackriveran457.3 - 449.6USA (New York) (325)