USGS home Scientific Investigations Map 2940 

Pacific NW Geologic Mapping Project

Geologic maps of the North Cascades

Ktf-1. View south from Mount Winthrop [RMnw] along crest of Cascade Range. Well-bedded sandstone of Cretaceous Three Fools Sequence of Haugerud and others (2002) (Ktf, rocks of Methow Ocean) form crest. Summit of Three Fools Peak is a thick conglomerate lens within the Three Fools Sequence. Divide at right was rounded by overriding Cordilleran Ice Sheet. Mixed glacial deposits (drift) from ice sheet and local alpine glaciers are visible in valley bottom (Qga). Qt, talus. This photo is figure 19 in the accompanying report (sheet 2). 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