Severn Formation
Geology
Members: unnamed (23), upper (4), uppermost (7)
Lithologies: not reported (8), "siliciclastic" (1), sandstone (25), "limestone" (21), dolomite (20), lignite (1)
Paleoenvironments: marine indet. (18), terrestrial indet. (2), shallow subtidal indet. (21), marginal marine indet. (1), coastal indet. (14)
Age range: base of the Rhuddanian to the top of the Early/Lower Maastrichtian or 443.40000 to 66.00000 Ma
Collections
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Rhuddanian | Canada (Manitoba) | (177635 177646) | |
Rhuddanian - Aeronian | Canada (Manitoba) | (177652) | |
Aeronian | Canada (Quebec) | (77347) | |
Aeronian - Telychian | Canada (Manitoba) | (177636 177637 177638 177647 177648 177653 177656 177657 177661 177662 177663 177674 177675 177676 177677 177685 177686) | |
Lochkovian | Russian Federation | (90329) | |
Cretaceous | USA (Maryland) | (125141) | |
Late/Upper Cretaceous | USA (Maryland) | (125074) | |
Maastrichtian | USA (Maryland) | (27562 27563 27564 27565 27566 27567 27568 83331 99439 127085 231271) | |
Early/Lower Maastrichtian | USA (Maryland) | (125950) | |
Late/Upper Maastrichtian | USA (Maryland) | (4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 82399 82400 82401 82402 82403 82404 82408) |