On Leonardo And A Fossil Whale: A Reappraisal With Implications For The Early History Of Palaeontology

A recent reappraisal of two passages in Leonardo da Vinci's Codex Arundel, in which the then young Leonardo reports on visiting a cave and on some sort of 'marine monster', has led to the proposition that Leonardo observed and wrote on fossil remains of a whale preserved in a cave. Whereas this hypothesis appears reasonable overall, some problems persist in accepting the purported location in which Leonardo would have observed the fossil. Here we provide a new analysis of the aforementioned passages by Leonardo which allows us to confirm that Leonardo saw a fossil whale and recognised it as such. However, his observation did not occur in a cave, but likely along the flank of a hill, as relatively common for Tuscan Pliocene fossil cetaceans. Leonardo seemingly made taphonomic observations on the fossil whale and inferred that a considerable amount of time must have passed from the death of the whale in the sea to allow for its eventual discovery on land - an observation that likely contributed to shaping Leonardo's later thoughts on sedimentation and fossilisation. This might represent Leonardo's earliest text devoted to a palaeontological theme. Moreover, it comprises the first known description of a cetacean fossil.