I've done this a dozen or more times now. I end up with a barren patch of dirt/clay that nothing grows in. I till about top 6 inches of soil, amend it with a mixture of compost, chicken manure, cow manure, green matter/waste, peat moss and a little sand in case of clay.
It basically immediately turns it into a productive patch of land that plants can thrive in. This is not novel a gardening technique.