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    Geologic dating relative absolute

    Disconformities are usually recognized by correlating from one area to another and finding that some strata is missing in one of the areas.

    Note that the geologic column was established and fairly well known before geologists had a means of determining absolute ages.Laws of Stratigraphy Original Horizontality - sedimentary strata are deposited in layers that are horizontal or nearly horizontal, parallel to or nearly parallel to the Earth's surface.Thus rocks that we now see inclined or folded have been disturbed since their original deposition.Assumes that we know the rate at which the salts (Na, Cl, Ca, and CO3 ions) are input into the oceans by rivers, and assumes that we know the rate at which these salts are removed by chemical precipitation.Calculations in 1889 gave estimate for the age of the Earth of 90 million years.

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