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
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