Ash Hollow Formation

Geology

Group: Ogallala

Members: unnamed (36), ? Cap Rock (1), Cap Rock (44), Merritt Dam (52)

Lithologies: not reported (21), "siliciclastic" (2), claystone (1), sandstone (4), ash (1)

Paleoenvironments: terrestrial indet. (126), fluvial indet. (1), coarse channel fill (1), fine channel fill (1), "channel" (2), lacustrine - small (1), pond (1)

Age range: base of the Barstovian to the top of the Clarendonian or 16.30000 to 9.40000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Barstovian16.3 - 12.5USA (South Dakota) (18138)
Clarendonian12.5 - 9.4USA (South Dakota) (18200 18325 18426 18429)
Clarendonian12.5 - 9.4USA (Nebraska) (18022 18024 18028 18037 18042 18047 18048 18053 18054 18057 18059 18060 18061 18092 18095 18099 18108 18118 18135 18142 18143 18145 18151 18171 18190 18194 18196 18202 18204 18214 18215 18218 18221 18226 18227 18228 18229 18231 18233 18234 18245 18246 18251 18253 18257 18277 18278 18279 18288 18291 18294 18302 18321 18322 18324 18328 18329 18330 18333 18335 18336 18348 18349 18366 18378 18396 18401 18409 18410 18419 18425 18430 18440 18446 18447 18456 18457 18458 18459 18460 18467 18468 18496 22636 26565 74098 159704 152238 188779 210955 210956 210957)
Late/Upper Clarendonian12.5 - 9.4USA (Nebraska) (18066 18207 18327 37802 37803 110828)
Clarendonian - Hemphillian12.5 - 4.9USA (Wyoming) (18146 18424)
Clarendonian - Hemphillian12.5 - 4.9USA (South Dakota) (18087 18139 18352 18421)
Clarendonian - Hemphillian12.5 - 4.9USA (Nebraska) (18023 18065 18069 18128 18134 18174 18180 18181 18236 18256 18269 18295 18305 18326 18404 18420 18433 18437 18438 18453)
Hemphillian10.3 - 4.9USA (Nebraska) (18043 18086 18225 18439)