It is also possible that the sea may have happened to flow little by little over the land consisting of both plain and mountain, and then have ebbed away from it. ... It is possible that each time the land was exposed bolle sunglasses by the ebbing of the sea a layer was left, since we see that some mountains appear to have been piled up layer armani sunglasses by layer, and it is therefore likely that the clay from which they were formed was itself at one time arranged in layers. One layer was formed first, then at a different period, a further was formed and piled, upon the first, and so on. christian dior sunglasses