USGS home Scientific Investigations Map 2940 

Kt-3. Cretaceous tonalite dike of Clark Mountain stock (Kt) intruding Napeequa Schist (Kns). Rotated schist fragments show magmatic nature of the deep-seated synorogenic pluton. Outcrop at head of Boulder Creek near Boulder Pass [Tsw].
Other photos that show unit Kt:

















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