USGS home Scientific Investigations Map 2940 

Pacific NW Geologic Mapping Project

Geologic maps of the North Cascades

QTcc-1. View northeast from point south of Ruth Mountain [MBnw] of 4 Ma quartz diorite and quartz monzodiorite of Icy Peak (QTcp) intruding 3.7 Ma rhyolite tuff of Hannegan caldera (QTcc) (Tucker and others, 2007). Contacts dashed where approximately located. View image without annotation
Other photos that show unit QTcc:

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