What are the differences between alluvial, eluvial and colluvial deposits?

Question

There's always confusion and disagreement when these terms are mentioned. Need to be sure of their exact meanings.

Answer 1

Alluvial: Detrital material which is transported by a river and usually deposited along the river's pathway, either in the riverbed itself or on its floodplain.

Colluvial: Weathered material transported by gravity action such as on scree slopes.

Eluvial: Weathered material still at or near its point of formation.

See:

http://www.saltworkconsultants.com/gemstones.html Scroll to figure L.

https://www.researchgate.net/figure/Conceptual-models-on-the-origin-of-A-eluvial-and-B-colluvial-deposits-Field-modern_fig13_277953946