saprolitic

saprolite

[sap-ruh-lahyt]
noun Petrography.
soft, disintegrated, usually more or less decomposed rock remaining in its original place.

Origin:
1890–95; sapro- + -lite

saprolitic [sap-ruh-lit-ik] , adjective
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World English Dictionary
saprolite (ˈsæprəʊlɪt)
 
n
a deposit of earth, clay, silt, etc, formed by decomposition of rocks that has remained in its original site
 
sapro'litic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
saprolite   (sāp'rə-līt')  Pronunciation Key 
Soft, thoroughly decomposed and porous rock, often rich in clay, formed by the in-place chemical weathering of igneous, metamorphic, or sedimentary rocks. Saprolite is especially common in humid and tropical climates. It is usually reddish brown or grayish white and contains those structures (such as cross-stratification) that were present in the original rock from which it formed.
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