Can this be how Prehistoric Ponyville may have looked?
It is awesome
totally amazing. i'll make of it my wallpaper of the month.
If you look at Hlissner's map of Equestria and Beyond, start from Ponyville, and move north-east (up-right), you will see a symbol of a dragon. That is where this is, I believe.
Now that's quite a lot of work, and it even has a pathway to go in there.