As long as you think its not contaminated with fertilizers or anything like that, give it a try. Maybe wash it a few times during the wet dry cycle with the topsoil?I've been doing a little research on my area's soil. I live in southern Virginia where any thing below 4 to 6 inches is know as Virginia red clay. Here's a little info I ran across at the VA DEQ:
"The A Horizon, or surface layer, is usually darker than the lower layers. It is most often loose and crumbly and contains more organic matter than deeper layers. In the A Horizon, water soaks or leaches into the soil with ease. Clay and other dense compounds are missing; they have been carried by water deeper into the soil profile.
The B Horizon is the subsoil. Subsoils are usually light colored and dense and contain little organic matter. Materials washed or "leached" from the A Horizon collect in the B Horizon. Therefore, this horizon holds more clay, iron and other mineral compounds."
I wonder how well it would work if I use the local red clay subsoil, and mix in store bought top soil. Go through the procedures, and leave the clay addition out. What do you guys think? Would the clay content be too much? Below is a photo of the red clay subsoil.