There isn't a single universally accepted term for soiled rock beneath surface soil and gravel. However, depending on the context and the specific nature of the rock and its soiling, several terms could be used:

* Regolith: This is a broad term for the loose, unconsolidated material that covers bedrock. It includes soil, gravel, and weathered rock fragments.

* Saprock: This term refers to weathered bedrock that is still partially solid, but is soft enough to be easily broken.

* Residual soil: This term describes soil formed in place from the weathering of underlying bedrock.

* Colluvium: This is a term for unconsolidated sediment that has been transported downslope by gravity.

* Glacial till: If the soil and gravel were deposited by a glacier, this term could be used to describe the material.

* Contaminated bedrock: If the rock is specifically contaminated with pollutants, this term might be used.

Ultimately, the best term to use will depend on the specific context and the nature of the rock and its soiling.