Smoky Hill Chalk Member

Geology

Group: Colorado

Formation: Niobrara

Lithologies: not reported (32), mudstone (1), "shale" (10), lime mudstone (7), chalk (78), "limestone" (2), "carbonate" (1)

Paleoenvironments: marine indet. (62), terrestrial indet. (1), carbonate indet. (25), deep subtidal shelf (3), offshore ramp (7), offshore indet. (27), basinal (carbonate) (1), coastal indet. (1), offshore (3)

Age range: base of the Late/Upper Coniacian to the top of the Santonian or 89.30000 to 83.60000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Coniacian89.8 - 86.3USA (Kansas) (85282)
Coniacian - Santonian89.8 - 83.6USA (Colorado) (227704)
Coniacian - Santonian89.8 - 83.6USA (Kansas) (84456 84457 84458 84698 85278)
Coniacian - Santonian89.8 - 83.6USA (South Dakota) (107782)
Late/Upper Coniacian89.3 - 85.8USA (Kansas) (118156 118151 118152 34700 49040 67200 74174 84459 99390 99391 99393 99395 99396 99397 106063 118153 118154 118155 118157 118159 118160 118161 118162 118163 210348 210349 212963 213409 213413 215763 215764 215770 215771)
Late/Upper Coniacian - Santonian89.3 - 83.6USA (Kansas) (28369 85238 93219 93390 117847 117856 118879 132511 174624 203740 229117 229118)
Late/Upper Coniacian - Early/Lower Santonian89.3 - 83.5USA (Kansas) (93380 93381 93383 93384 93388 101104 123571 123572 123574 215772)
Late/Upper Coniacian - Middle Santonian89.3 - 83.5USA (Kansas) (189448)
Late/Upper Coniacian - Early/Lower Campanian89.3 - 70.6USA (Kansas) (232231)
Santonian86.3 - 83.6USA (South Dakota) (160520)
Santonian86.3 - 83.6USA (Colorado) (97589 160521 160522 179211)
Santonian86.3 - 83.6USA (Kansas) (84697 85276 93217 93225 93220 93221 93234 93233 93386 93391 93422 99383 99384 99385 116624 117841 117843 117846 117851 118183 118875 123577 160519 167919 188486 188487 191649 203742 210347 210350 220909 221063 221064 221066 221077 221103)
Santonian86.3 - 83.6Canada (Manitoba) (107803)
Santonian86.3 - 83.6USA (Nebraska) (193536)
Early/Lower Santonian85.8 - 83.5USA (Kansas) (215769)
Late/Upper Santonian85.8 - 83.5USA (Kansas) (109698 93387 85284 93218 93389 118338 132510 188488 203741 206749 212962 212995 213523 213529 213530)
Middle Santonian85.8 - 83.5USA (Kansas) (49044 49045 103989 231052 231053)
Middle Santonian85.8 - 83.5USA (New Mexico) (100169)