Not with plate movement and continuing wasting of uplifted material, it’s not a static situation. Where I live in western Oregon, there are sedimentary rock that have been pushed up due to the subduction of the ocean flower off the coast. Mudstone, shale, limestone and sandstone has been scraped off the subducting ocean floor, creating the coast range which is constantly eroding. To the east, in the cascades, andesite and volcanic ash is piling up into a mountain range and at the same time eroding. More land slides, etc.
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No cigar.
Sediments are rarely involved in destructive deep slides. The clayey material has to sit at the bottom of a body of still water to create the deep soil banks.
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