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Pacific NW Geologic Mapping Project

Geologic maps of the North Cascades

QTcc-2. South side of Hannegan Peak [MBnw] revealing bedded 4.7 Ma rhyolite tuff of caldera fill (QTcc). Granite Mountain to left (northwest) is eroded from the ~30 Ma Baker River Phase (Tcai) of the Chilliwack batholith.
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