Cap Rock Member

Geology

Group: Ogallala

Formation: Ash Hollow

Lithologies: not reported (4), claystone (1), sandstone (1), ash (1)

Paleoenvironments: terrestrial indet. (43), lacustrine - small (1), pond (1)

Age range: Clarendonian or 12.50000 to 9.40000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Clarendonian12.5 - 9.4USA (South Dakota) (18325 18426 18429)
Clarendonian12.5 - 9.4USA (Nebraska) (18022 18024 18057 18060 18061 18092 18108 18118 18151 18190 18194 18196 18204 18215 18233 18234 18251 18253 18278 18279 18288 18294 18324 18328 18329 18330 18335 18349 18396 18409 18430 18440 18456 18459 18460 22636 74098 159704 152238 188779)
Late/Upper Clarendonian12.5 - 9.4USA (Nebraska) (18207)
Clarendonian - Hemphillian12.5 - 4.9USA (South Dakota) (18352)