Lance Formation

Geology

Group: Montana

Members: unnamed (178), Cannonball (2), Chiule (1), Torrington (4)

Lithologies: not reported (104), "siliciclastic" (1), claystone (2), mudstone (4), "shale" (16), siltstone (7), sandstone (50), conglomerate (1), marl (1), "limestone" (1), coal (1)

Paleoenvironments: marine indet. (2), terrestrial indet. (168), coastal indet. (1), estuary/bay (1), delta plain (1), fluvial indet. (5), "channel" (3), "floodplain" (1), fluvial-lacustrine indet. (5)

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

Time interval Ma Country or state Original ID and collection number
Maastrichtian72.1 - 66.0USA (Wyoming) (225939 225940)
Maastrichtian72.1 - 66.0Australia (Western Australia) (83759)
Lancian70.6 - 66.0USA (Wyoming) (14505 14510 14511 14514 14519 14522 14524 14526 14527 14538 14557 14561 14564 14565 14566 14567 14570 14577 14578 14579 14586 14587 14588 14589 14590 14591 14592 14593 14596 14598 14601 14606 14609 14625 14626 14641 14642 14643 14644 14656 26626 45844 60172 72145 128558 133002 137531 137795 137796 137797 181269)
Lancian70.6 - 66.0USA (Montana) (179991)
Late/Upper Maastrichtian70.6 - 66.0USA (Utah) (48549)
Late/Upper Maastrichtian70.6 - 66.0USA (Montana) (48562 49005 55326 91359 142326 142753 150931 179968 189403)
Late/Upper Maastrichtian70.6 - 66.0USA (South Dakota) (47628 48551 50082 50084 69214 142375 150889 150890 150891 150892 150893 150894 150895 179969 179970 191272)
Late/Upper Maastrichtian70.6 - 66.0USA (Wyoming) (14585 22638 26760 34494 34747 34921 34922 34967 34968 34969 34970 45843 45845 45846 45878 46117 46119 46120 46125 46126 46127 46128 46129 46130 46131 46132 46133 46134 46135 46136 46138 46209 48327 48558 48559 48626 49238 50085 50086 50087 50930 50931 52089 52106 52107 52681 52682 52683 52684 52685 52686 52687 52688 52689 52690 52691 52692 52693 52694 52695 52871 54176 54177 54178 54179 57159 57158 57161 57162 57163 57166 57168 57169 57170 57764 60555 64644 64645 99864 115750 118461 118466 122902 123098 123570 128559 137798 142325 150932 150933 150976 164991 164992 164993 171094 175972 180016 189513 191271 225936 226054 226055 230284)
Late/Upper Maastrichtian70.6 - 66.0USA (North Dakota) (84018 87483)
Late/Upper Maastrichtian70.6 - 66.0Canada (Saskatchewan) (45728)