Well ya know, evidently this idea of giant trees in prehistoric times began circulating the net about 2 years ago, though this is the first time I'd run in to the idea. I do agree with Nivek that this image below looks like and is more logically seen as part of a fossilized tree than a pile of rocks.
Much of what has been passed off as knowledge of pre~history isn't any more logical or scientific than the alternative explanation. I've written about the problems with dinosaurs elsewhere, but the primary problem is one of gravity, for
dinosaurs, the really big ones like a Brontosaurus, meaning "thunder lizard," simply can not survive in our present gravity.
This is where movies like Jurassic Park took license and ignored what I'm sure the technical expert advisors to those films already knew, and so you have to think that when a film like Jurassic Park shows a Brontosaurus in it they are doing that knowing that species would not be able to be revived even if we can or later are able to re~create their genetic code.
This bibliotecapleyades link extensively examines the issues.
Dinosaurs and The Gravity Problem