Abstract
Spheroidal weathering, in which concentric shells completely surround a corestone, is distinguished from other types of exfoliation. After a brief description of field observations, the many suggested causes of spheroidal weathering are discussed. Hypotheses proposed involve expansion (produced in various ways), unloading, constant volume alteration, Liesegang phenomena, micro-cracks, and several minor or special-case mechanisms. The term “spheroidal weathering” still applies to several different features formed in different ways.
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