Bearpaw Shale Formation

Geology

Group: Montana

Members: unnamed (90), Belanger (7), Broderick (1), Manyberries (1), Snakebite (1)

Lithologies: not reported (14), claystone (2), mudstone (5), "shale" (79), sandstone (1), "limestone" (2), "carbonate" (1)

Paleoenvironments: marine indet. (94), terrestrial indet. (1), coastal indet. (1), offshore (3), fluvial-lacustrine indet. (1)

Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.50000 to 66.00000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Campanian83.6 - 72.1USA (Montana) (187419 167793 194178)
Late/Upper Campanian83.5 - 70.6Canada (Saskatchewan) (23368 28008 31120 31121 31122 31123 88475 88476 88477 88478 88479 88480 88481 88482 88483 88484 88485 88486 88487 88488 88489 88490 88495 88499 88500 88501 88502 88503 88504 88505 88506 88507 88508 88509 194177)
Late/Upper Campanian83.5 - 70.6Canada (Alberta) (23367 62734 88491 88493 119087 119088 119089 127257 132555 135807 139189 162138 192669 204697)
Late/Upper Campanian83.5 - 70.6USA (Montana) (26766 26767 62723 88462 88463 88464 88465 102069 107428 107718 111375 175762 177980 178029 178316 178317 178318 178319 178320 178321 178323 178324 178325 178326 178327 178328 178329 178330 178331 178332 178333 178334 178335 178336 178337 178338 178339 178340 178341 233379)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0Canada (Alberta) (162134 162135 162136 162137)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0Canada (Saskatchewan) (100237 155307)
Maastrichtian72.1 - 66.0USA (Montana) (87747)
Early/Lower Maastrichtian70.6 - 66.0USA (Montana) (196671)