Cedar Mountain Formation

Geology

Group: Dakota

Members: unnamed (8), Buckhorn Conglomerate (2), Mussentuchit (52), Poison Strip Sandstone (6), Ruby Ranch (13), Yellow Cat (18)

Lithologies: not reported (34), "siliciclastic" (1), claystone (3), mudstone (37), "shale" (7), siltstone (9), sandstone (21), conglomerate (1), "limestone" (5), dolomite (1), chert (5)

Paleoenvironments: terrestrial indet. (59), estuary/bay (5), delta plain (2), fluvial indet. (6), channel lag (1), "channel" (2), "floodplain" (3), crevasse splay (10), mire/swamp (1), fluvial-lacustrine indet. (3), pond (1), lacustrine delta plain (1), lacustrine indet. (6), spring (1)

Age range: base of the Valanginian to the top of the Bridgerian or 139.80000 to 46.20000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Berriasian - Valanginian145.0 - 132.9USA (Utah) (50052 97949 222719)
Late/Upper Berriasian - Valanginian145.0 - 132.9USA (Utah) (97954 97957)
Berriasian - Albian145.0 - 100.5USA (Utah) (225152)
Early/Lower Cretaceous145.0 - 100.5USA (Utah) (121695)
Valanginian139.8 - 132.9USA (Utah) (24894 27017 27025 48326 49617 52352 73890 97953 97956 97958 105613 133038 190355 225120 230405)
Aptian125.0 - 113.0USA (Utah) (49615 49616 51919 67202 97955)
Aptian - Albian125.0 - 100.5USA (Utah) (27047 27067 55334 60814 60815 97950 97951 103969 105095 154232 154238 201626 225122 230406)
Early/Lower Albian - Late/Upper Albian112.03 - 99.6USA (Utah) (121688 121692 121693)
Late/Upper Albian105.3 - 99.6USA (Utah) (224187)
Cenomanian100.5 - 93.9USA (Utah) (235574)
Early/Lower Cenomanian99.6 - 93.5USA (Utah) (14394 14395 14396 14397 14398 14399 14400 14401 14402 14403 14404 14405 14406 14407 22679 23501 27033 27046 27048 31193 31194 52973 73611 73612 73613 73614 73615 94550 97952 97959 117467 121687 152628 181580 185614 200123 204698 206450 206451 206452 206748 223378 223379 223380 223381 228452 228453 228454 228455 231485 235540 235578 235579)
Bridgerian50.3 - 46.2USA (Wyoming) (16405 55207)