I agree completely with the last two posts.
I bought 2 cubic yards from a local "dirt yard". In their yard, the pile of topsoil seemed pretty light and open, some sand or grit and good tiny clod structure.
After the truck showed up and dumped it, it looked like typical heavy clay soil. Quick to compact and clods were more pliable than crumbly. Maybe the "good stuff" was just drier, maybe the good stuff was on the front of the heap and the trucks took worse soil from the back of the heap. Maybe it just lost its seeming structure during the short drive and dump.
At least it was clay soil (probably less than 40% clay) and not clay (40-100% clay).