Well, the challenge is over... I sorta won the battle but lost the war.
I rented a jackhammer today and my brother and I went at it for about 6 hours. It was all the two of us could handle in the 80+ temp... and me being 69 and him 67, it took a quite a bit out of these tired old bodies.
We discovered that the rock is granite, and VERY hard. We managed to chip about 8 inches off the top before we called it quits. My brother wanted to continue, saying we can do it if we just keep trying...and take enough time. Being 2 years younger than me he hasn't fully grasped the concept of gaining wisdom with age and enough is enough. Oh, to be young again. And he wasn't paying the $75/day rent for the hammer either.
This gets the rock so that it's just below the surface of the drive way and basically satisfies my needs.
I filled in the hole and the ramp I made, but someone must have snuck in over night and stolen about a truckload of dirt as there isn't enough to fill everything back up to the levels it was before.
I never heard the truck or the loader, though.
So I won the battle. Maybe if I'd done it 20 years ago when I was a bit younger, I'd have won the war.