Chalk Butte Formation

Geology

Members: unnamed (2)

Lithologies: not reported (1)

Paleoenvironments: terrestrial indet. (2)

Age range: Hemphillian or 9.40000 to 4.70000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Hemphillian9.4 - 4.7USA (Oregon) (18943 18944)