Niobrara Formation
Geology
Group: Colorado
Members: unnamed (22), Fort Hays Limestone (34), Lower (1), Smokey Hill Chalk (1), Smoky Hill (6), Smoky Hill Chalk (130), Smoky Hill Shale (47)
Lithologies: not reported (45), mudstone (1), "shale" (39), sandstone (7), gravel (1), lime mudstone (9), chalk (89), grainstone (1), "limestone" (53), "carbonate" (1)
Paleoenvironments: marine indet. (109), terrestrial indet. (3), carbonate indet. (45), deep subtidal shelf (28), offshore ramp (9), offshore indet. (28), basinal (carbonate) (1), coastal indet. (8), deltaic indet. (1), offshore (10)
Age range: base of the Late/Upper Turonian to the top of the Early/Lower Campanian or 93.50000 to 70.60000 Ma
Collections