Spheroidal weathering (a.k.a. exfoliation) results in the rounding off of corners and sharp edges of rock masses.  It tends to occur in intrusive igneous rocks (e.g., the exfoliation domes in the Yosemite Valley area, California, USA) and some massive sandstones (e.g., Arches National Park, Utah, USA).


Spheroidal weathering in diabase, a mafic intrusive igneous rock, from Haverstraw, southeastern New York State, USA.



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