Depth of rock wall in gorge is hundreds of feet

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  • The crumbling walls of the gorge are shale, composed of clay and silt that fell on top of the lime mud and hardened into rock. At the very top of the cliff walls are sturdier layers of sandstone and siltstone. The limestone in the stream bed is pitted in spots, due to chemical weathering from slightly-acidic rainwater. Freezing and thawing of the gorge walls splits the shale into fragments that eventually fall. That’s physical weathering, and it makes climbing the fragile walls extremely dangerous.n
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ancient blocks bridge carved cementing clay cliff crumbling devonian erosion evolution fingerlakes flx geologic geology glacial gorge gorges gray heavy ithaca ithacaisgorges lake lime limestone mineral mud overlook rock sandstone sediment shale shallow silt slabs steep stone stream taughannock tons trails trumansburg walls waterways weathering

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