Hell Creek Formation

Geology

Group: Montana

Members: unnamed (557), Breien (10), Little Beaver Creek (1), Lower (4), Middle Sandstone (1), Pretty Butte (4), Upper (13)

Lithologies: not reported (114), "siliciclastic" (1), claystone (14), mudstone (77), "shale" (19), siltstone (50), sandstone (243), conglomerate (10), "limestone" (1), amber (1)

Paleoenvironments: marine indet. (16), terrestrial indet. (261), coastal indet. (2), estuary/bay (1), fluvial indet. (26), channel lag (20), coarse channel fill (18), fine channel fill (99), "channel" (42), wet floodplain (10), "floodplain" (46), crevasse splay (36), fluvial-lacustrine indet. (1), fluvial-deltaic indet. (1), lacustrine - small (2), pond (14)

Age range: base of the Late/Upper Albian to the top of the Puercan or 106.30000 to 63.40000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Late/Upper Albian106.3 - 100.5USA (Montana) (89474)
Late/Upper Albian106.3 - 100.5USA (Wyoming) (191873)
Late/Upper Albian - Early/Lower Cenomanian106.3 - 93.9USA (Montana) (97885 234731)
Early/Lower Cenomanian100.5 - 93.9USA (Montana) (234733 234734)
Lancian72.2 - 66.0USA (North Dakota) (14610 14620 14621 25500 25501 25909 25910 25911 25912 25913 25914 25915 25916 25917 25918 25919 25920 25921 25922 25923 25924 48181 48182 48183 48184 48185 48186 48187 48188 48189 48190 48191 48192 48194 48195 48196 48197 48198 48199 48200 48201 48202 48203 48204 48205 48206 48207 48209 48210 48211 48212 48213 48214 48215 48216 48217 48218 48219 48220 48221 48222 48223 48224 48225 48226 48227 48228 48229 48230 48231 48232 48233 48234 48236 48237 48238 48239 48240 48241 48242 48243 48244 48245 48246 48248 48249 48250 48251 48252 48253 48254 48255 48256 48257 48258 48259 48260 48261 48262 48263 48264 48265 48266 48267 48272 48273 48274 48275 48276 48277 48278 48279 48280 48281 48282 48283 48284 48285 48286 48287 48288 48289 48290 48291 48292 48293 53234 137601 137704 137705 137706 137707 137708 137710 137711 137712 137713 137715 137716 137722 137723 137724 137727 137728 137729 137730 137731 137732 183291 183292 224667)
Lancian72.2 - 66.0USA (South Dakota) (14537 14604 31955 48193 48208 48235 48247 192251 223934)
Lancian72.2 - 66.0USA (Montana) (14506 14507 14508 14509 14512 14513 14515 14516 14517 14520 14521 14523 14525 14528 14529 14530 14531 14532 14533 14534 14535 14536 14546 14547 14548 14549 14550 14552 14553 14556 14559 14560 14562 14563 14568 14572 14574 14575 14576 14580 14582 14583 14594 14595 14597 14600 14605 14608 14611 14613 14614 14615 14616 14617 14618 14622 14623 14624 14627 14628 14629 14639 14645 14646 14647 14648 14649 14650 14651 14652 14653 14654 81041 81042 118483 137565 144499 144500 144501 144502 144503 144504 144505 144506 172642 172644 176678 176680 176689 183290 192242 192243 192244 192246 192247 192248 192249 192250 223935)
Late/Upper Maastrichtian72.2 - 66.0USA (South Dakota) (24790 45388 45389 45390 47034 97798 124934 156591 157189 174241 206554 216603 221943 224370 224483 224484 224486 224487 224488 224489 224490 224491 224492)
Late/Upper Maastrichtian72.2 - 66.0USA (North Dakota) (24851 33437 45098 45099 45102 45109 45110 45111 45112 45114 45117 45118 45119 45120 45122 45123 45124 45128 45130 45133 45134 45136 45137 45143 45144 45145 45299 45309 45381 45382 45386 57919 118381 122903 122904 127733 137718 137720 141582 141583 154928 179279 179281 179282 179283 179284 179285 179286 179287 179288 191374 224669 229450)
Late/Upper Maastrichtian72.2 - 66.0USA (Montana) (11931 13142 14674 45879 48622 48629 52903 52904 54080 55354 59374 60169 67129 72143 73947 73948 88990 99441 99881 100110 109659 110464 119007 119009 122905 122906 123099 123683 128458 129262 131865 131973 142491 152397 157187 161171 162855 173842 183109 183110 189003 192047 202036 206797 206798 217033 217034 217035 217037 217038 217039 217041 217183 221004 221005 221006 221007 224286 225035 227182 227283 229083 230093 238642 239512)
Maastrichtian72.2 - 66.0USA (Montana) (12977 13184 32403 34094 35510 38544 47626 47627 48836 48844 48845 48846 48847 48848 49016 50088 53228 53516 54002 54081 55353 55355 55385 57765 57914 60766 64428 64429 74009 83299 85498 85499 88987 88988 100852 109660 109661 123100 142376 142489 142490 142492 142493 142526 167426 173841 189572 190696 190697 190698 190699 190700 192041 194864 227221 228491 237407)
Maastrichtian72.2 - 66.0USA (Wyoming) (225318 225319)
Maastrichtian72.2 - 66.0USA (North Dakota) (45100 45101 45103 45104 45105 45106 45107 45108 45113 45115 45116 45121 45125 45126 45127 45129 45131 45132 45135 45138 45139 45140 45141 45142 45146 45147 45297 45298 45308 45311 45312 45313 45314 45316 45318 45319 45320 45380 45383 45384 45385 45387 48843 84455 99589 142488 190693 190694 190695 227364 234420 234421 234422 234572 234573 234574 234585 234586 234587 234588 234599 234600 234615 234616 234617 234618 234619 234620)
Maastrichtian72.2 - 66.0USA (South Dakota) (45391 45392 53128 58813 74175 124207 225317 225924 233264)
Puercan66.0 - 63.4USA (Montana) (14660 14663 14667 14668 14669 14671 14672 14675 14676 14690 14696 14697 14698 14699 14700 14701 14702 14705 14740 14741 14749 14751 14752 14753 14754 14755 14757 14758 14763 14767 14771 14772 14773 14775 14776 14777 14778 14779 14780 14781 14782 14784 14785 14786 14787 14788 14789 14801 14802 108198 108199 168338 168339 176688)