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21-Sep-2017 00:52

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Third, the radiometric ages agree, within analytical error, with the relative positions of the dated ash beds as determined by the geologic mapping and the fossil assemblages; that is, the ages get older from top to bottom as they should.Finally, the inferred age of the shocked quartz, as determined from the age of the melted feldspar in the Manson impact structure (74.1 ± 0.1 Ma), is in very good agreement with the ages of the ash beds above and below it.

Others are from larger asteroids that got hot enough to melt and send lava flows to the surface. The most primitive type of meteorites are called chondrites, because they contain little spheres of olivine crystals known as chondrules.Second, ages were measured on two very different minerals, sanidine and biotite, from several of the ash beds.



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