Smoky Hill Shale Member

Geology

Group: Colorado

Formation: Niobrara

Lithologies: "shale" (23), sandstone (6), "limestone" (18)

Paleoenvironments: marine indet. (22), deep subtidal shelf (11), coastal indet. (7), offshore (7)

Age range: base of the Coniacian to the top of the Santonian or 89.80000 to 83.60000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Late/Upper Turonian93.5 - 89.3USA (New Mexico) (82259 82281)
Coniacian89.8 - 86.3USA (New Mexico) (82244 82245 82246 82247 82249 82250 82251)
Early/Lower Coniacian89.3 - 85.8USA (New Mexico) (87847)
Early/Lower Coniacian89.3 - 85.8USA (Colorado) (74304)
Late/Upper Coniacian89.3 - 85.8USA (Colorado) (74310 74311 74312 74313 74314 74316 74317 74318 74320 74321)
Late/Upper Coniacian89.3 - 85.8USA (New Mexico) (82248)
Middle Coniacian89.3 - 85.8USA (Colorado) (74305 87851)
Santonian86.3 - 83.6USA (Colorado) (87853)
Santonian86.3 - 83.6USA (New Mexico) (82261 82264 82268 82269 82271 82272 87850)
Early/Lower Santonian85.8 - 83.5USA (Colorado) (74322 74323 74324 74325 87852 87854)
Late/Upper Santonian85.8 - 83.5USA (Colorado) (74331 87855)
Middle Santonian85.8 - 83.5USA (New Mexico) (87848 87849)
Middle Santonian85.8 - 83.5USA (Colorado) (74326 74327 74328 74329 74330)