rivermusic: Around Jenny LakeGrand Teton National Park, Wyoming(gneiss, quartz, granite, garnet, sch
rivermusic:Around Jenny LakeGrand Teton National Park, Wyoming(gneiss, quartz, granite, garnet, schist)photo by rivermusic, June 2013Geologist looking at these would recognize a combination of igneous and metamorphic rocks, containing the minerals noted above, mostly coarse grained. The rocks in the Teton area include some portions of the Earth’s most ancient crust, today lifted up by the faults in the area and exposed. These bits of the crust then wash down streams, are somewhat rounded, and end up in photographs like this. -- source link
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