Thanks for clarifying! I envy you your deep soil. I have heavy clay over fractured limestone rock. In spots, the rock comes right up out of the surface, in other places the soil is fairly deep but you do come up against the occasional fragment of limestone. One interesting thing is that in some spots you can find clay-shale, which is sort of clay in the process of becoming rock. Sometimes this turns up a fossil (usually a little leaf or something; no T. Rex here...)
