Labels:text | screenshot | font OCR: the periphery by the lightening of their mass. The page ends with a reference to fossilized salt water shells, many of which Leonardo found at different elevations on his paleon- tological expeditions in Lombardy. He reasons that since the earth has fallen in on itself, and the oceans have filled in the spaces, "marine shells and oysters . .. are seen in high mountains." C With evidence that seemingly verifies his water and mountain theories, he concludes that "these are found in all the valleys that open out into the seas." D