Arpa Formation

Geology

Members: unnamed (57)

Lithologies: "limestone" (57)

Paleoenvironments: carbonate indet. (57)

Age range: base of the Wordian to the top of the Early/Lower Maastrichtian or 266.90000 to 66.00000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Wordian266.9 - 264.28Armenia (81998 82062 88702 97385 97386 97387 97388 97389 97390 97391 97392 97398 102498 102505 110798 110799 110800 110801 110802 110803 110804 110805 110806 110807 110901 110911)
Wordian266.9 - 264.28Azerbaijan (82113 94932 94933 94934 94935 94936 94937 94938 94939 95711 102499 102502 110882 110883 110884 110885 110886 110887 110888 110889 110890 110891 110892 110893 110894 110896 110897 110898 110899 110900 133273)
Late/Upper Cenomanian99.6 - 93.5France (230895)
Santonian86.3 - 83.6Argentina (Río Negro) (84309 45407 47798 51581 114763)
Santonian86.3 - 83.6Argentina (Mendoza) (149816)
Santonian86.3 - 83.6Argentina (Neuquén) (13305 32368 47796 47797 47808 47810 51569 58749 63679 112698 114543 114545 114762 114765 118195 128567 147178 176562 196207 197477 219649 232217 235260)
Middle Santonian85.8 - 83.5Argentina (Neuquén) (56157)
Campanian83.6 - 72.1USA (Montana) (187419 164852 167793 194178)
Late/Upper Campanian83.5 - 70.6Canada (Saskatchewan) (23368 28008 31120 31121 31122 31123 87441 87442 88475 88476 88477 88478 88479 88480 88481 88482 88483 88484 88485 88486 88487 88488 88489 88490 88495 88499 88500 88501 88502 88503 88504 88505 88506 88507 88508 88509 194177 212985 226181)
Late/Upper Campanian83.5 - 70.6Canada (Alberta) (23367 62734 82638 82639 82640 82641 82642 88491 88493 119087 119088 119089 127257 132555 135807 139189 162138 192669 204697 210457 212983 212984 212986 230440 230441 230442)
Late/Upper Campanian83.5 - 70.6USA (Wyoming) (233963 234311)
Late/Upper Campanian83.5 - 70.6USA (Montana) (26766 26767 62723 88462 88463 88464 88465 102069 107428 107718 111375 175762 177980 178029 178316 178317 178318 178319 178320 178321 178323 178324 178325 178326 178327 178328 178329 178330 178331 178332 178333 178334 178335 178336 178337 178338 178339 178340 178341 212997 212998 212999 213000 213001 213002 213003 213073 213074 213075 213076 213077 213078 213079 213080 213082 213083 213084 213085 213086 213087 213088 213089 213090 213091 213093 213157 213158 213159 213160 213161 213162 213163 213164 213165 213166 213167 213170 213171 213172 213173 213174 233379)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0Canada (Alberta) (162134 162135 162136 162137)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0USA (Montana) (213168)
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0Canada (Saskatchewan) (100237 155307)
Maastrichtian72.1 - 66.0USA (Montana) (87747 213081)
Early/Lower Maastrichtian70.6 - 66.0Canada (Saskatachewan) (234104)
Early/Lower Maastrichtian70.6 - 66.0Canada (Saskatchewan) (226182)
Early/Lower Maastrichtian70.6 - 66.0USA (Montana) (196671 213092)