saprolite
Saprolite is a soft, earthy, and thoroughly decomposed rock, often rich in clay, that is formed in situ by the chemical weathering of igneous, metamorphic, or sedimentary rocks that retains some of the original rock's structures.
Saprolite is a soft, earthy, and thoroughly decomposed rock, often rich in clay, that is formed in situ by the chemical weathering of igneous, metamorphic, or sedimentary rocks that retains some of the original rock's structures.