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Intrusive Columbia River Basalt. OR.
Cliffs of intrusive Columbia River Basalt Group are part of a giant sill at Neahkahnie Mountain, Oregon. Coast Range in the background. (170826-72)
Download ImageTalc Mine, SE California.
Talc, formed by metasomatic reaction of Proterozoic diabase sill (below) with dolomite of Crystal Springs Fm (above). Mojave Desert, California. (Res-12)
Download ImageTalc deposit, Death Valley, California
Talc deposit, formed by contact metamorphism at contact of mafic sill and dolomite. Proterozoic Crystal Spring Formation, Death Valley National Park, California. (Met-21)
Download ImagePegmatite intruding gneiss , California
Note how irregular the contact is between the two, and the small sill of pegmatite intruding along foliation in the gneiss. (Image ID # Ig-08)
Download ImageIntrusive contact (vertical)
Contact of granitic igneous rock (tonalite) with metamorphic rock (slate). Note the small sills (apophyses) which invade the country rock. (090704-14)
Download ImagePegmatite intruding Gneiss
Pegmatite intruding Precambrian Gneiss as a dike (left side) and sill (middle). Death Valley National Park, California. Ig-08.
Download Image
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