Notes on the origin and significance of stone layers

Abstract

Stone layers are stratiform and consist of thin beds or attenuated lenses of angular clasts. Some are due to wash associated with heavy rain followed by concentration of coarse debris by the winnowing of fines by wash and wind. Others are due to soil-churning hydrophilic clays. The first type reflects the widespread occurrence of 'storm' rains, the second, alternations of wet and dry periods in suitable substrate environments.