Sceince of dating events using ice

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"Astronomical theory permits a very detailed evaluation of past climate events that may provide an analog for future climate." To find the signature of a resonance transition, Meyers, Sageman and UW-Madison graduate student Chao Ma, whose dissertation work this comprises, looked to the geologic record in what is known as the Niobrara Formation in Colorado.The formation was laid down layer by layer over tens of millions of years as sediment was deposited on the bottom of a vast seaway known as the Cretaceous Western Interior Seaway.In the context of the solar system, the phenomenon occurs when two orbiting bodies periodically tug at one another, as occurs when a planet in its track around the sun passes in relative proximity to another planet in its own orbit.These small but regular ticks in a planet's orbit can exert big changes on the location and orientation of a planet on its axis relative to the sun and, accordingly, change the amount of solar radiation a planet receives over a given area.The shallow ocean stretched from what is now the Arctic Ocean to the Gulf of Mexico, separating the eastern and western portions of North America.

It plays on the idea that small changes in the initial conditions of a nonlinear system can have large effects over time.

Dating of the Mars-Earth resonance transition found by Ma, Meyers and Sageman was confirmed by radioisotopic dating, a method for dating the absolute ages of rocks using known rates of radioactive decay of elements in the rocks.

In recent years, major advances in the accuracy and precision of radioisotopic dating, devised by UW-Madison geoscience Professor Bradley Singer and others, have been introduced and contribute to the dating of the resonance transition.

J.; Morgan, Vin; Souney, Joe M.; and Mayewski, Paul Andrew, "High-precision Dating of Volcanic Events (A. 1301–1995) Using Ice Cores from Law Dome, Antarctica" (2001).

Palmer, Anne S.; van Ommen, Tas D.; Curran, Mark A.

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