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Pacific NW Geologic Mapping Project

Geologic maps of the North Cascades

QTcp-3. Granite of Cascade Pass family (QTcp) on the west wall of Nooksack cirque in foreground. Ruth Mountain [MBnw] to northeast is carved from volcanic breccia of Pliocene Hannegan caldera (QTcc). Both rocks formed in the Cascade Magmatic Arc. Extensive glacial moraine (Qag) covers valley floor. Contact dashed where approximately located. This photo is figure 12 in the accompanying report (sheet 2). View image without annotation
Other photos that show unit QTcp:

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