Steno, Nicolaus (1638–1686)

Nicolaus Steno, also called Niels Stenson, was a Danish geologist, anatomist, and bishop. In 1669 he published the results of his geological studies, in which he established the law of superposition of strata, that fossils are the remains of once living creatures, and that they can be used for dating purposes, and established many of the tenets of modern crystallography.