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Such sediment, even if from nearby hills, would normally carry very little organic material as the weathering slopes, themselves, would not have much to begin with.Sediment, in the form of dust, would normally come from very dry areas where organic material would be quickly oxidized.
Large areas of Canada, for instance, have been eroded down to the Precambrian basement rock!
At about the three-foot level (in the center of the yard) the red-brown clay is abruptly terminated by a reddish conglomerate we call hardpan.
A few sickly-looking roots, long dead for all I can tell, do penetrate the clay, usually by hugging the surfaces of the boulders, before being stopped cold by the hardpan.
(Peat bogs and coal-forming swamps are an exception, but we would not count them as topsoils.
Under unusual conditions a layer of topsoil can be "fossilized," even to the point of preserving the three-dimensional shape of tree leaves, as is the case at Yellowstone National Park.) In the long run, buried sediments are usually cemented into sedimentary rock, which brings us back to the beginning of this cycle.
I suspect that most of them belong to plants which were chopped down years ago.
There's not much down there in that clay to completely rot them away.
Sudden changes in temperature will have a smaller effect on the deeper parent rock.
With the exception of the organic content, drawn mostly from the atmosphere, and the larger volume that broken rock takes up (which may raise the soil some distance above the original surface), in situ soils build .
The geologic history of the strata making up the Grand Canyon is as much a history of erosion as it is of deposition!
Consequently, a patch of soil cannot be older than the last local erosion--whenever that might have been.
Those "scientific" creationists who trot this plum about must be delirious!