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This is usually the fate of every plot of land which remains above sea level long enough.Large areas of Canada, for instance, have been eroded down to the Precambrian basement rock!Fewer roots now reach the parent rock, and, in the bottom layers, the organic content of the soil is greatly reduced.That means less chemical weathering from bacteria and fungi.Sudden changes in temperature will have a smaller effect on the deeper parent rock.
Either it is collecting sediment or being eroded away, usually the latter. Water-borne sediment will be washed in from higher ground, perhaps hills and mountains hundreds of miles away. Those "scientific" creationists who trot this plum about must be delirious!Do they really believe that we should wind up with x miles of topsoil (or some such nonsense) after billions of years?Take the soil in my mother's backyard, for example.After about 18 inches the soil grades into a two-foot matrix of solid, smooth clay mixed with boulders.