Five laws of relative dating

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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 1916.This principle allows us to piece together the succession of fossil life that defines much of the geologic time scale. And we know of many more causes, from tectonics to intrusions, that can tilt and fold rocks."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.Prior to the late 17th century, geologic time was thought to be the same as historical time.Archbishop James Ussher of Armagh, Ireland, 1654, added up generations from the Old Testament and determined that Earth formed on October 23, 4004 BCE.

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Steno also noticed that fossil seashells could be found in rocks and mountains far from any ocean. Steno proposed that if a rock contained the fossils of marine animals, the rock formed from sediments that were deposited on the seafloor. Relative age means age in comparison with other rocks, either younger or older."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.Media diversity and freedom is markedly higher in Kabul, and some warlords display limited tolerance for independent media in the areas under their control.

A number of journalists were threatened or harassed by government ministers, politicians, and others in positions of power as a result of their reporting.Early geologists had no way to determine the absolute age of a geological material. What they could do was determine the ages of materials relative to each other.

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