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"At the time when any given stratum was being formed, all the matter resting upon it was fluid, and, therefore, at the time when the lower stratum was being formed, none of the upper strata existed."Today we restrict this principle to sedimentary rocks, which were understood differently in Steno's time. strata either perpendicular to the horizon or inclined to it, were at one time parallel to the horizon."Steno reasoned that strongly tilted rocks did not start that way, but were affected by later events—either upheaval by volcanic disturbances or collapse from beneath by cave-ins.

Basically, he deduced that rocks were laid down in vertical order just as sediments are laid down today, under water, with new on top of old. Today we know that some strata start out tilted, but nevertheless this principle enables us to easily detect unnatural degrees of tilt and infer that they have been disturbed since their formation.

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"Materials forming any stratum were continuous over the surface of the Earth unless some other solid bodies stood in the way."This principle allowed Steno to link identical rocks on opposite sides of a river valley and deduce the history of events (mostly erosion) that separated them.(light brown) Next, fossil-rich sedimentary rocks were precipitated.These rocks are tilted due to deposition on the non-horizontal surfaces of primitive rocks.In 1669, Niels Stensen (1638-1686), better known then and now by his Latinized name Nicolaus Steno, formulated a few basic rules that helped him make sense of the rocks of Tuscany and the various objects contained within them.His short preliminary work, (Provisional report on solid bodies naturally embedded in other solids), included several propositions that have since become fundamental to geologists studying all kinds of rocks.

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