Chalk Hills Formation
Geology
Group: Idaho
Members: unnamed (7)
Lithologies: not reported (1), siltstone (4), sandstone (1), conglomerate (1), ash (2)
Paleoenvironments: terrestrial indet. (4), lacustrine indet. (3)
Collections
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Miocene | USA (Idaho) | (18942) | |
Late/Upper Miocene | USA (Idaho) | (191558 191559) | |
Hemphillian | USA (Idaho) | (18926 19765) | |
early Early Hemphillian - late Early Hemphillian | USA (Idaho) | (218109 218111) |