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Pacific NW Geologic Mapping Project

Geologic maps of the North Cascades

KJos-1. Fossil of rough clam (?Trigonia sp.) in coarse-grained sandstone of the Patterson Lake unit of McGroder and others (1991), included in our rocks of the Methow Ocean, older sedimentary rocks (KJos). The sandstone here, on the west side of Patterson Mountain [Tne], was probably a beach deposit.
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Photo Indices: Captions (Additional photos home) | Map | Young rocks and deposits | Older rocks west | Older rocks east