White River Formation, Group

Geology

Formations: unnamed (7), Arikaree (1), Brule (25), Chadron (5)

Members: unnamed (22), Beaver Divide Conglomerate (1), Big Sand Draw Sandstone Lentil (2), Horsetail Creek (1), lower (3), upper (6), Vista (1)

Lithologies: not reported (36), "siliciclastic" (6), claystone (1), mudstone (1), siltstone (2), sandstone (1), tuff (1)

Paleoenvironments: terrestrial indet. (65), fluvial indet. (6), "channel" (1), wet floodplain (1), "floodplain" (1)

Age range: base of the Early/Lower Chadronian to the top of the Rupelian or 37.20000 to 28.10000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Chadronian37.2 - 33.9USA (Wyoming) (16896 16897 16898 16901 16902 16903 16905 16907 16908 16911 16920 16922 16923 16960 16961 16962 16963 16964 16965 16966 17011 181608 199544)
Chadronian37.2 - 33.9USA (Colorado) (16977 27244)
Chadronian37.2 - 33.9USA (Nebraska) (99591 99593 99595)
Chadronian37.2 - 33.9USA (Montana) (16990)
Early/Lower Chadronian37.2 - 33.9USA (Wyoming) (16904 16906)
Early/Lower Chadronian37.2 - 33.9USA (Montana) (68415)
Middle Chadronian - Late/Upper Chadronian37.2 - 33.9USA (Colorado) (156988)
Chadronian - Orellan37.2 - 33.3USA (South Dakota) (154199)
Chadronian - Orellan37.2 - 33.3USA (Wyoming) (16993 17063)
Orellan33.9 - 33.3USA (Colorado) (13296 17081 17082 17083 17197 118198 136087 180029 180696 180723 232908)
Orellan33.9 - 33.3USA (Wyoming) (17060 17147 99678 125185 180388 232918)
Orellan33.9 - 33.3USA (South Dakota) (17067 17136 179966 180116 224881 232916)
Orellan33.9 - 33.3USA (Nebraska) (17160 17175 99590 99592 179967 180108 180112 180113 207804 232924)
Orellan - Whitneyan33.9 - 30.8USA (Wyoming) (207058)
Rupelian33.9 - 28.1USA (South Dakota) (190539)
Oligocene33.9 - 23.03USA (Colorado) (180120)
Whitneyan33.3 - 30.8USA (Colorado) (17426)
Arikareean29.5 - 18.5USA (Wyoming) (17492)