Geologic Unit: Berthoud

Usage:

Berthoud Plutonic Suite (CO*,KS*,NM*,OK*,WY*)

Subunits:

(alphabetical): Cripple Creek Granite (CO*) or Cripple Creek Quartz Monzonite (CO*), Curecanti Quartz Monzonite (CO*), Electra Lake Gabbro (CO*), Eolus Granite (CO*), San Isabel Granite (CO*), Silver Plume Granite (CO*) or Silver Plume Quartz Monzonite (CO*), /Sherman Granite (CO*), St. Kevin Granite (CO*), Trimble Granite (CO*), Vernal Mesa Quartz Monzonite (CO*).

Geologic age:

Mesoproterozoic*

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

Type area: Silver Plume batholith area. Named from Berthoud Pass, Clear Creek Co., CO (Tweto, 1987).

AAPG geologic province:

Northern Rocky Mountain region*
Southern Rocky Mountain region*
Midcontinent region*