USGS home Scientific Investigations Map 2940 

Pacific NW Geologic Mapping Project

Geologic maps of the North Cascades

Jis-1. Mount Stuart, viewed from point near Lake Ingalls [Wnw], is granodiorite and quartz diorite of the Mount Stuart batholith, included in the Late Cretaceous tonalitic stitching plutons (Kt). The batholith intruded ultramafic rock of the Ingalls terrane (Jis), which crops out in the lower slopes of the peak and in the foreground. View image without annotation
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Photo Indices: Captions (Additional photos home) | Map | Young rocks and deposits | Older rocks west | Older rocks east