I like the way you explain it. This is something iv started to realise these past few days.
Now correct me if im wrong but i remember reading somewhere (this is about 2 years ago) that they have found fossilised trees spanning several of these layers. I dont have any links or anything sorry because this was in a book i saw in the school library, and all this talk of layers made me remember it. Now how does anyone explain this? And i remember this pretty well so my memorys not fuzzy on what the chapter was about, basically they have found trees that pass through several layers. How could this happen?