Geologic units in Cavalier county, North Dakota

Additional scientific data in this geographic area

Pierre Formation (Upper Cretaceous) at surface, covers 94 % of this area

Dark-gray shale; marine offshore sediment; as thick as 700 metres (2,300 feet).

Niobrara Formation (Upper Cretaceous) at surface, covers 3 % of this area

Light-brown to dark-gray calcareous shale; marine offshore sediment; as thick as 75 metres (250 feet).

Carlile Formation (Upper Cretaceous) at surface, covers 2 % of this area

Dark-gray shale; marine offshore sediment; as thick as 120 metres (400 feet).

Greenhorn Formation (Upper Cretaceous) at surface, covers 0.4 % of this area

Dark-gray calcareous shale; marine offshore sediment; as thick as 45 metres (150 feet).

Belle Fourche Formation (Upper Cretaceous) at surface, covers 0.2 % of this area

Medium- to dark-gray, silty to sandy shale; marine offshore sediment; as thick as 105 metres (350 feet).