Even Stanley couldn't handle the jandal :-(
We've checked every hardware store we could find in five different cities, but never found a good strong garden fork to loosen our horrible compacted soil with. So when we visited New Zealand we got a good strong Stanley fork which is a brand renowned for excellent quality and workmanship.
We carted the thing all the way back here on three planes ad numerous taxis and buses, and finally started using it a week ago! It was really good for a while, but after a few sessions it became clear that even the best fork from the west wasn't good enough to handle our situation out here :-(
It looks like we're going to have to find or make a proper broadfork which is made to be able to handle the full body weight forcing it through compact soil even if it's full of stones. The main differences are that it's wider so you can do more with each pull, it has two handles so you can stand in the middle to use the full weight and momentum of your body, and its prongs are very wide in the direction needed to resist the force of the earth against it, but narrow horizontally so it cuts through easily.