USGS home Scientific Investigations Map 2940 

Pacific NW Geologic Mapping Project

Geologic maps of the North Cascades

JTrc-1. Cultus Formation of Brown and others (1987) (JTrc) of the Chilliwack River terrane. Typical outcrop of finely laminated tuffaceous argillite near Canadian border, north of Bald Lake [MBnw].
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Photo Indices: Captions (Additional photos home) | Map | Young rocks and deposits | Older rocks west | Older rocks east