I for one, am unable to determine what your argument is. In a depositional environment, old landscapes are being constantly replaced, by new sediment that now sits atop the old landscape, forming the surface of the new landscape.
Eventually, if this process is uninterrupted, new landscapes are deposited on to the old continually and the old landscapes are eventually buried deep enough to form rock. Everything in that layer of sediment has been dead a long time and does not need anywhere to go. I don't see the problem.
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