Geologic Unit: Chaffee

Usage:

Chaffee Formation (CO*)
Chaffee Group (CO*)

Subunits:

GROUP STATUS (alphabetical): Dyer Dolomite (CO*) or Dyer Formation (CO), Gilman Sandstone (CO*), Parting Formation (CO*).
FORMATION STATUS (alphabetical): Dyer Member (CO*), Parting Member (CO*).

Geologic age:

Late Devonian and/or Early Mississippian(?)*

Type section, locality, area and/or origin of name:

Named from Chaffee Co., CO, where it is well exposed south of Arkansas River about 5 mi southeast of Salida, and on western slope of Monarch Mountain, at Monarch, about 15 mi southwest of Salida (Kirk, 1931).

AAPG geologic province:

Eagle basin*
Piceance basin*
South Park basin*
Green River basin