Ahearn Member

Geology

Formation: Chadron

Lithologies: not reported (1), marl (1)

Paleoenvironments: terrestrial indet. (3)

Age range: Chadronian or 37.20000 to 33.90000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Chadronian37.2 - 33.9USA (South Dakota) (13097 16885 168799)