Residual parent materials have generally been subjected to weathering for a longer period of time than have lacustrine or alluvial parent materials.

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Residual parent materials have been exposed to weathering processes for a longer period of time due to their formation through the in situ decomposition of underlying bedrock. In contrast, lacustrine or alluvial parent materials are formed through depositional processes and may not have undergone as much weathering.

Residual Parent Materials Have Generally Been Subjected to Weathering for a Longer