Hemingford Group

Geology

Formations: Marsland (25), Runningwater (1)

Lithologies: not reported (24), sandstone (2)

Paleoenvironments: terrestrial indet. (24), fluvial indet. (1), "channel" (1)

Age range: base of the Early/Lower Hemingfordian to the top of the Harrisonian or 20.43000 to 18.50000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Harrisonian24.8 - 18.5USA (Nebraska) (17735 17736 17737 17738 17739 17741 17744 17789 17791 17809 17842 17858 22641 195408)
Harrisonian24.8 - 18.5USA (Wyoming) (17785 17788 17793 17817 17820 17824 17833 17835 17838 17840 17850)
Early/Lower Hemingfordian20.43 - 15.97USA (Nebraska) (17865)