The wheel track on the stone pavement
I wonder why the wheel track disappear on the way.
http://sora.ishikami.jp/image_dir/images/2009/20090506215405.jpg
The wheel track on the stone pavement proves stone was soft at first.
The stone pavements are told to be "the skin of Stone gods" and the wheel tracks which can be seen here and there show a part of Stone gods were soft.
The above image is the the evidence which can explain the stone was soft at first.