Antonio Vallisneri

"One will see a layer of smooth stones, popularly called fluitati [diluvium], and over these another layer of smaller pebbles, thirdly sand, and finally earth, and you will see this repeatedly...up to the summit of the Mountain. This clearly shows that the order has been caused by many floods, not just one."

"Many have observed and many still expect to observe, but not everyone has observed well, and others do not know how to observe, nor perhaps do they know how tricky the art of observation is, easily misunderstanding one thing for another, being blinded by the light, or not looking with due attention and diligence at what is to be looked at."