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What are the four laws of relative dating

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Cutler, A. The Seashell on the Mountaintop. New York: Dutton. Levin, H. The Earth Through Time [6th Ed. McPhee, J.
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5 Key Principles of Relative Dating in Geology

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4 laws of relative dating

In , Niels Stensen , 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, De Solido Intra Solidum Naturaliter Contento — Dissertationis Prodromus 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. Three of these are known as Steno's principles, and a fourth observation, on crystals, is known as Steno's Law. The quotes given here are from the English translation of Today we restrict this principle to sedimentary rocks, which were understood differently in Steno's time. 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. This principle allows us to piece together the succession of fossil life that defines much of the geologic time scale.
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4 laws of relative dating

In , a young doctor named Nicholas Steno was invited to dissect the head of an enormous great white shark that had been caught by local fisherman near Florence, Italy. Steno was struck by the resemblance of the shark's teeth to fossils, known as "tongue stones", recovered from inland mountains and hills Figure While it may seem obvious today, most people at the time did not believe that fossils were once part of living creatures. The reason was that the fossils of clams, snails, and other marine animals were found in tall mountains, miles from any ocean.
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Figure Time is the dimension that sets geology apart from most other sciences. Geological time is vast, and Earth has changed tremendously during this time. Even though most geological processes are very, very slow, the vast amount of time that has passed has allowed for the formation of extraordinary geological features, as shown in Figure We have numerous ways of measuring geological time.
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