ammonites

Morrison Formation

Geology

Members: unnamed (111), Brushy Basin (139), Brushy Basin/Salt Wash (1), Bushy Basin (1), Lake Como (1), Recapture (1), Recapture Creek (1), Salt Wash (24), Tidwell (1), Unit B (4), Westwater (1)

Lithologies: not reported (68), "siliciclastic" (1), claystone (35), mudstone (73), "shale" (4), siltstone (20), sandstone (83), conglomerate (3), marl (2), lime mudstone (6), "limestone" (11), ash (2), tuff (1)

Paleoenvironments: terrestrial indet. (103), carbonate indet. (1), coastal indet. (5), estuary/bay (1), deltaic indet. (1), fluvial indet. (4), alluvial fan (1), channel lag (3), coarse channel fill (5), fine channel fill (2), "channel" (39), wet floodplain (38), dry floodplain (12), "floodplain" (5), crevasse splay (14), levee (4), fluvial-lacustrine indet. (9), lacustrine - large (1), lacustrine - small (1), pond (18), lacustrine indet. (16)

Age range: base of the Oxfordian to the top of the Tithonian or 161.200 to 145.500 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Jurassic201.6 - 145.5USA (Colorado) (136080)
Oxfordian161.2 - 155.7USA (Utah) (28360)
Late/Upper Oxfordian - Early/Lower Kimmeridgian161.2 - 150.8USA (Wyoming) (126540)
Late/Upper Oxfordian - Kimmeridgian161.2 - 150.8USA (New Mexico) (84308)
Late/Upper Jurassic161.2 - 145.5USA (New Mexico) (24802)
Late/Upper Jurassic161.2 - 145.5USA (Montana) (24668 24670)
Late/Upper Jurassic161.2 - 145.5USA (Wyoming) (36270 62561)
Late/Upper Jurassic161.2 - 145.5USA (Utah) (13275 24797 24799 24800)
Late/Upper Jurassic161.2 - 145.5USA (Colorado) (13277 24801)
Early/Lower Kimmeridgian155.7 - 150.8USA (Colorado) (48156)
Kimmeridgian155.7 - 150.8USA (New Mexico) (38871)
Kimmeridgian155.7 - 150.8USA (Utah) (46436 46437 46438 46439 46440 56321 57913 58515 61676 62207 64053 137198 137199)
Kimmeridgian155.7 - 150.8USA (Colorado) (11925 68024 35293 38883 48155 48160 48170 48171 48172 49621 53021 53041 56590 59375 123526)
Kimmeridgian155.7 - 150.8USA (Wyoming) (38884 46460 46462 46465 46468 46469 47065 49577 55349 57903 58510 75453 92105)
Kimmeridgian155.7 - 150.8USA (Montana) (49624 69890)
Late/Upper Kimmeridgian155.7 - 150.8USA (Wyoming) (22650)
Kimmeridgian - Tithonian155.7 - 145.5USA (Wyoming) (12816 13212 13214 13352 22648 49627 57893 39253 39337 39338 39339 39340 39342 39344 39345 39346 39347 39368 39369 39370 39371 39373 39374 39426 39427 39428 39430 39431 48557 48565 48837 49628 49634 49636 49637 52815 52816 55206 55320 55323 55330 55333 55483 55484 55486 55487 56165 56167 57900 57895 57894 57899 57897 57898 57896 57901 57902 58507 58508 58509 58511 58512 58513 62576 67537 67538 68100 73998 74000 74664 74665 93138 100228 106532 142334 142335 142336 142337)
Kimmeridgian - Tithonian155.7 - 145.5USA (Utah) (21852 22711 47196 49595 49614 49626 53035 55350 58514 58516 58517 58518 58551 96826 96840 97942 104715 131064)
Kimmeridgian - Tithonian155.7 - 145.5USA (Colorado) (11611 11924 13341 22708 25141 28005 28366 28382 36576 39375 39376 39377 39419 39421 48124 48127 48128 48130 48146 48147 48148 48149 48150 48151 48152 48153 48154 48157 48158 48161 48162 48163 48164 48165 48166 48167 48168 48169 49622 49623 49652 52872 52917 52919 52920 52921 52923 53022 55195 56586 56596 56599 56683 56684 58811 66909 66910 66911 66912 66913 66914 68097 70026 70027 70028 70029 70030 102476 137733 137746)
Kimmeridgian - Tithonian155.7 - 145.5USA (Montana) (50714 142333)
Kimmeridgian - Tithonian155.7 - 145.5USA (Oklahoma) (89979 92285)
Kimmeridgian - Tithonian155.7 - 145.5USA (Arizona) (70024 94678 94773 94774)
Kimmeridgian - Tithonian155.7 - 145.5USA (New Mexico) (38867 22717 36265 38872 38873 51990 51991 51992 57910 119021 119022 119023 119024 119025 119026 119027 119090)
Kimmeridgian - Tithonian155.7 - 145.5USA (South Dakota) (36268 49631 49633 57904 57905)
Late/Upper Kimmeridgian - Early/Lower Tithonian155.7 - 145.5USA (Colorado) (45975)
Late/Upper Kimmeridgian - Tithonian155.7 - 145.5USA (New Mexico) (68099)
Late/Upper Kimmeridgian - Tithonian155.7 - 145.5USA (Colorado) (55329 70031 70032)
Late/Upper Kimmeridgian - Tithonian155.7 - 145.5USA (Montana) (38866)
Late/Upper Kimmeridgian - Tithonian155.7 - 145.5USA (Wyoming) (22678 74663)
Late/Upper Kimmeridgian - Tithonian155.7 - 145.5USA (Oklahoma) (49338 49596 49597 49598 56421 56422)
Early/Lower Tithonian150.8 - 145.5USA (Wyoming) (55482 56654)
Early/Lower Tithonian150.8 - 145.5USA (Colorado) (53040 71476 92360)
Middle Tithonian150.8 - 145.5USA (Utah) (52110)
Tithonian150.8 - 145.5USA (Wyoming) (39412 39429 49629)
Tithonian150.8 - 145.5USA (Colorado) (48129)
Tithonian150.8 - 145.5USA (South Dakota) (49625 49630 132242 132243)