Wow.. bad news.  Steve's taken a big digger by the sounds of it.
I go to Parwan now & again (I live 15mins away), and I can tell you that it is as hard as concrete & rocky.  Real blue-groove!  If he's managed to doze a furrow into that surface, he's hit it hard.  Tony Greig's key wouldn't make a dent in it.
Steve, I've taken up a lot of driving & retreated to the soft, sandy loam of Gippsland.. I highly recommend it! 

Get well soon!  
Neil R 
(EMC/CZ #46)