Graneros Shale Formation

Geology

Group: Colorado

Members: unnamed (9), Thatcher Limestone (1)

Lithologies: claystone (1), "shale" (7), sandstone (1), "limestone" (2)

Paleoenvironments: marine indet. (7), carbonate indet. (1), offshore (2)

Age range: base of the Early/Lower Cenomanian to the top of the Cenomanian or 99.60000 to 93.90000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Cenomanian100.5 - 93.9USA (Montana) (130808)
Cenomanian100.5 - 93.9USA (Colorado) (230801)
Cenomanian100.5 - 93.9USA (Iowa) (88017)
Early/Lower Cenomanian99.6 - 93.5USA (Colorado) (77350)
Late/Upper Cenomanian99.6 - 93.5USA (Iowa) (88008 88009)
Middle Cenomanian99.6 - 93.5USA (Wyoming) (123469)
Middle Cenomanian99.6 - 93.5USA (Nebraska) (213308 213401)
Middle Cenomanian99.6 - 93.5USA (Kansas) (117816)