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Summary
DescriptionBlock-glide.jpg
English: Block glide at Mile Marker 23 along I-99 in Blair County, Pennsylvania. Part of a hill of Devonianshale was removed to make the road, forming a dip-slope. The upper block detached along a bedding plane and is sliding down the hill, forming a jumbled pile of rock at the toe of the slide. Photo taken in 1997 and uploaded by James Stuby.
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Original upload log
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2007-05-11 14:52 Jstuby 777×410 (300683 bytes) Block glide at Mile Marker 23 along [[I-99]] in [[Blair County, Pennsylvania|Blair County]], [[Pennsylvania]]. Part of a hill of [[Devonian]] [[shale]] was removed to make the road, forming a dip-slope. The upper block detached along a bedding plane and
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