I still hope to write Not Your Usual Rocks, so we went off looking for petrified trees. There were two lots that I had read about, around Lake Macquarie, and I managed to find both sites. The Blackall Park one, however, was hard, and the area is so pillaged that I won't say how to get there: if you have a special need, contact me with an email address for a reply with how-to-get-there details.
This item on the left was in the area: I suspect some joker was playing games. It is NOT what we were seeking.
On the right, you can see the real thing, as viewed at high tide.
We found just two. This is not a Good Thing.
Over the millennia, water has seeped through the joints, and soaked into the rock, producing these patterns. First, here is a ranging shot to show you where to go: from this part of the cliff, turn left and go along the concrete (there's some sort of drain there), until you get to here:
Now move in and look for things like this:
The last two are also dry, but I have loaded these as hi-res. Try clicking on them.
And please, enjoy!
I have just found a few useful side bits in Wikipedia under