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Pacific NW Geologic Mapping Project

Geologic maps of the North Cascades

Tcai-2. Oligocene granodiorite of the Chilliwack batholith (Index family, Tcai) exposed on the ridge west of the upper East Fork of Bacon Creek [MBse]. View northeast to the Northern Picket Range. Glacial erratics on this glacier-smoothed surface at ~2,000 m elevation indicate that the Cordilleran Ice Sheet covered the ridge.
Other photos that show unit Tcai:

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Photo Indices: Captions (Additional photos home) | Map | Young rocks and deposits | Older rocks west | Older rocks east