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Pacific NW Geologic Mapping Project

Geologic maps of the North Cascades

TKmd-3. North face of Bonanza Peak [Tsw], highest nonvolcanic peak in the North Cascade Range at 9,511 ft elevation, viewed from south side of Mount Lyall. The massif is underlain by Marblemount meta-quartz diorite (TKmd). Photographed in 1980.
Other photos that show unit TKmd:

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