This is a block of Swainland Road, at the high end of the Glen Highlands neighborhood hard under the powerline ridge just south of Route 24. The bedrock is mapped as Great Valley Sequence sandstone. It’s a lot harder and stronger than much of the rock in the hills, but it still doesn’t like being exposed and oversteepened. It’s steadily encroaching on the sidewalk, trying to reach a more comfortable angle. Vegetation would probably help.
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