Fox Hills Formation

Geology

Group: Montana

Members: unnamed (83), Fairpoint (2), Iron Lightning (4), Stoneville (1), Timber Lake (47), Trail City (72), Trail Creek (1), White Owl Creek (1)

Lithologies: not reported (7), "siliciclastic" (92), claystone (1), "shale" (4), siltstone (2), sandstone (111), "limestone" (1), "carbonate" (1)

Paleoenvironments: marine indet. (146), terrestrial indet. (3), marginal marine indet. (11), coastal indet. (33), estuary/bay (2), paralic indet. (9), deltaic indet. (3), shoreface (6), transition zone/lower shoreface (2), offshore (2), coarse channel fill (1)

Age range: base of the Lancian to the top of the Late/Upper Maastrichtian or 70.60000 to 66.00000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Late/Upper Cretaceous100.5 - 66.0USA (Colorado) (203434)
Maastrichtian72.1 - 66.0USA (North Dakota) (207337 231457 231458 231461 231462 231463 231466 231467 231469)
Maastrichtian72.1 - 66.0USA (Wyoming) (1576 176023)
Maastrichtian72.1 - 66.0USA (South Dakota) (90926 151542 229369 229573)
Maastrichtian72.1 - 66.0USA (Colorado) (123482 176843)
Maastrichtian72.1 - 66.0USA (Montana) (32405 34054)
Early/Lower Maastrichtian70.6 - 66.0USA (South Dakota) (53484 53485)
Lancian70.6 - 66.0USA (South Dakota) (14571 14612)
Late/Upper Maastrichtian70.6 - 66.0USA (Wyoming) (178588 178307 178309 178310 178311 178313 178314 178589 178590 178591 178592 178593 178594 178595 178596 178625 178626)
Late/Upper Maastrichtian70.6 - 66.0USA (North Dakota) (178556 179280 179289 179290 179291 179292 179293 179295 213580 213581 213582 213583 213584 213585 213586 213587 213588 213589 213590 213591 213592 213593 213594 213595 213596 213597 213598 213599 213600 213601 213602 213603 213604 213605 213606 213607 213608 213609 213610 213611 213612 213613 213614 213615 213616 213617 213618 213619 213620 213621 216569 231459 231464 231465)
Late/Upper Maastrichtian70.6 - 66.0USA (Colorado) (151864 178281 178283 178285 178287 178288 178289 178290 178291 178292 178293 178296 178298 178299 178300 178301 178302 178304 178305 178308 178312)
Late/Upper Maastrichtian70.6 - 66.0USA (South Dakota) (88510 88511 171173 178315 178553 178554 178555 178557 178558 178559 178560 178561 178562 178563 178564 178565 178566 178567 178568 178570 178571 178572 178573 178574 178575 178576 178577 178578 178579 178580 178581 178582 178583 178584 178585 178586 178597 178598 178599 178600 178601 178602 178603 178604 178605 178606 178607 178608 178609 178610 178611 178612 178613 178614 178615 178616 178617 178618 178619 178620 178621 178622 178623 178624 178628 178629 178630 178631 178632 178633 178634 178635 178636 178637 178638 178639 178640 178641 178642 178643 178644 178645 178646 178647 178648 178649 178650 178651 178652 178653 178654 178655 178656 178657 178658 179294 179296 194136 212987 212988 212989 212990 229449)