Pierre Shale Formation, Group

Geology

Group: Montana

Formations: Sharon Springs (2)

Members: unnamed (112), Beecher Island (2), DeGrey (4), Elk Butte (2), Gammon Ferruginous (8), Lake Creek Shale (2), Larimer Sandstone (19), Lower unnamed shale (18), Millwood (3), Mitten Black Shale (25), Mobridge (4), Monument Hill Bentonitic (1), Pembina (33), Red Bird Silty (36), Richard Sandstone (6), Rocky Ridge (1), Salt Grass Shale (3), Sharon Springs (33), Terry Sandstone (1), Upper (1), upper unnamed shale (24), Virgin Creek (4), Weskan Shale (2)

Lithologies: not reported (21), "siliciclastic" (11), claystone (4), mudstone (1), "shale" (283), siltstone (2), sandstone (19), conglomerate (1), marl (1), "limestone" (76), "carbonate" (4), ironstone (1), ash (20)

Paleoenvironments: marine indet. (183), terrestrial indet. (2), offshore indet. (2), coastal indet. (4), transition zone/lower shoreface (1), offshore (133), basinal (siliciclastic) (6), deep-water indet. (15)

Age range: base of the Early/Lower 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 - 72.1Canada (Manitoba) (36754)
Campanian83.6 - 72.1USA (Wyoming) (1626 1628 1632 1638 1641 1643 1630 1635 1637 1644 1647 1648 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1667 1669 1670 1671 1672 1673 1674 1675 1676 1677 1679 1680 1681 1682 1683 1684 1666 1668 1678 1712 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1731 1732 1733 1734 1735 1736 1738 1739 1740 1741 1743 1742 1730 1713 105717 107672 107675 232172)
Campanian83.6 - 72.1USA (Colorado) (134953 217722 233960)
Campanian83.6 - 72.1USA (Nebraska) (107400 191322)
Campanian83.6 - 72.1USA (Montana) (57142 107426)
Campanian83.6 - 72.1USA (South Dakota) (28367 52084 101100 107642 107644 107671 107673 107674 107678 107679 107711 107779 107781 109761 142359 142414 154803)
Campanian83.6 - 72.1USA (Kansas) (71829 71830 71831 71832 71833 71834 71835 71836 106060 107677 107710)
Campanian - Early/Lower Maastrichtian83.6 - 66.0USA (South Dakota) (167918)
Campanian - Maastrichtian83.6 - 66.0USA (Colorado) (123398)
Campanian - Maastrichtian83.6 - 66.0USA (New Mexico) (123397)
Early/Lower Campanian83.5 - 70.6USA (South Dakota) (35333 39388 94635 94636 94637 94638 94639 94641 94643 94644 94645 94646 94647 94648 213531)
Early/Lower Campanian83.5 - 70.6Canada (Manitoba) (23307 23321 23323 23337 23338 23339 23366 36446 96685 193919 193920 193921 193922 193923 193924 193925 193926 193927 193929 193930 193931 193932 193933 193934 193935 193936 193937 193938)
Early/Lower Campanian83.5 - 70.6USA (Wyoming) (1737 186542 77348 94650 117858 117859 186543)
Early/Lower Campanian - Middle Campanian83.5 - 70.6Canada (Manitoba) (78226 127632 193928)
Early/Lower Campanian - Middle Campanian83.5 - 70.6USA (Wyoming) (77312)
Early/Lower Campanian - Middle Campanian83.5 - 70.6USA (South Dakota) (77316 102092 107676 117861)
Early/Lower Campanian - Middle Campanian83.5 - 70.6USA (Nebraska) (116621)
Early/Lower Campanian - Middle Campanian83.5 - 70.6USA (Kansas) (77321 114240)
Late/Upper Campanian83.5 - 70.6USA (Wyoming) (1616 1629 1639 1640 1642 1645 1646 1649 1650 88440 88441 88442 88450 88451 178342 178344 178346 233962)
Late/Upper Campanian83.5 - 70.6USA (North Dakota) (179297)
Late/Upper Campanian83.5 - 70.6USA (South Dakota) (78181 107704 107780 123581 123582 212982 212993 212994)
Late/Upper Campanian83.5 - 70.6USA (Colorado) (88452 88453 88454 88455 88456 88457 88458 88459 88460 88461 88467 88468 88471 88473 88474 90153 90154 90155 90156 90158 90159 152077 162249 178347 178348 178349 178350 178351 178352 178353 178354 178527 178528 178529 178530 178531 178532 178533 178534 178535 178536 178537 178538 178539 178540 178541 178542 216750 232420 233378)
Late/Upper Campanian83.5 - 70.6USA (Montana) (78170 88438 88439 88470)
Late/Upper Campanian83.5 - 70.6USA (Nebraska) (88472 178345)
Middle Campanian83.5 - 70.6USA (Wyoming) (117860 212991 212992 212996 233170)
Middle Campanian83.5 - 70.6USA (North Dakota) (232234)
Middle Campanian83.5 - 70.6USA (Kansas) (25692 49039 132509 136267)
Middle Campanian83.5 - 70.6Canada (Manitoba) (84462 84463 84464 84465 84466)
Middle Campanian83.5 - 70.6USA (South Dakota) (85236 94640)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0USA (South Dakota) (134955 234107)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0USA (Colorado) (90157 90160)
Late/Upper Campanian - Maastrichtian83.5 - 66.0USA (Wyoming) (1617)
Maastrichtian72.1 - 66.0USA (Montana) (191856 191857)
Maastrichtian72.1 - 66.0USA (North Dakota) (191854)
Maastrichtian72.1 - 66.0Canada (Alberta) (72265)
Maastrichtian72.1 - 66.0USA (Wyoming) (1585 1587 1589 1590 1591 1592 1593 1594 1595 1596 1597 1578 1580 1615 1614 1618 87746)
Maastrichtian72.1 - 66.0USA (South Dakota) (90228 90229 90230 135805)
Early/Lower Maastrichtian70.6 - 66.0USA (Montana) (178355 178356 178357 178358 197464)
Early/Lower Maastrichtian70.6 - 66.0USA (Wyoming) (1579 1582 1584 1586 1588 1575 1577 78177 191855 229344)
Early/Lower Maastrichtian70.6 - 66.0USA (South Dakota) (88513 88514 134956 178587 234106)
Early/Lower Maastrichtian - Late/Upper Maastrichtian70.6 - 66.0USA (Kansas) (71837)
Early/Lower Maastrichtian - Late/Upper Maastrichtian70.6 - 66.0USA (Colorado) (71838)
Late/Upper Maastrichtian70.6 - 66.0USA (Wyoming) (1581)
Late/Upper Maastrichtian70.6 - 66.0USA (South Dakota) (88512 178569 178627)
Late/Upper Maastrichtian70.6 - 66.0USA (Colorado) (178280 178282 178284 178286 178294 178295 178297 178303 178306)