Scree vs. talus Both are slope debris, but scree often refers to smaller, angular fragments, while talus can include larger blocks. The size difference matters for movement risk and the tools you need.
Scree vs. colluvium Colluvium is slope‑moved material that can include soil and mixed debris. Scree is typically cleaner, rock‑fragment dominated. If the matrix is soil‑rich and mixed, “colluvium” may be more accurate.
Scree vs. float Float can be any transported rock, including in streams. Scree is specifically slope debris below a source outcrop. If you’re tracing source, scree points upslope; stream float points upstream.
Stable scree vs. active scree Some scree slopes are locked in place; others are actively moving. Active slopes are hazardous and can bury tools or specimens—treat stability as a safety factor, not just a site description.