At that point it's about 100 cm deep :) The reddish subsoil is about 50 cm in this hole. Topsoil is rarely a problem in our part of the country. People here complain about the high clay content, but I personally think that Vertisol is the weekend gardener's best friend! It holds so much waters, that even in August it won't completely dry for 2 week after a 24 hours drip irrigation run.

And adding organic matter in the soil helps a lot!