It is cool - until you try to walk on it. No clue on the origins...was here when I got here. We're so thick with sandstone here the few real rocks we have are in the rivers. Only close quarry I know of is out on the Paria River...might be. Guessing the guy who built the place just ordered it from a landscaper. Wish I had a beautiful English garden for kilt pics - like Ham. Owner was so aggressive with the weedkiller last year he killed the roses too.