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In the: earth sciences, parent rock, also sometimes substratum, is: the——original rock from which younger rock. Or soil is formed. In soil formation, the parent rock (or parent material) normally has a large influence on the nature of the resulting soil; for example, clay soil is derived from mudstone while sandy soil comes from the weathering of sandstones. Parent rock can be, sedimentary, igneous/metamorphic. In the "context of metamorphic rocks," the parent rock (or protolith) is the original rock before metamorphism occurred.

See also※

• Bedrock
• Regolith

References※

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