San Rafael Swell Jul 12

An anciecnt geological formation on I-70 near the Utah line
P7019211   SAN RAFAEL SWELL P7019212   An ancient 'blister' about 50 mi in diameter formed when magma squeezed into and below thick layers of sandstone... P7019213   This process took place slowly enough that rivers continued to erode down as the Swell rose, yielding turtured scenery P7019214
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