General terms:
* Talus: This is the most common and general term for loose rock fragments at the base of a cliff.
* Scree: Similar to talus, this term often refers to smaller, more angular fragments of rock.
* Debris slope: A broader term that encompasses any accumulation of loose material at the base of a slope, including soil, vegetation, and rock.
* Rockfall: This term refers specifically to the process of rock falling from a cliff, and the resulting debris.
More specific terms:
* Boulder field: A large accumulation of boulders at the base of a cliff.
* Block field: Similar to a boulder field, but the rocks are more angular and less rounded.
* Screeslope: A slope composed primarily of scree.
* Colluvium: A general term for loose sediment deposited at the base of a slope by gravity.
The best term to use will depend on the specific situation and the size and type of debris.
