Kauai dating

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Ideal conditions within an ancient cave system are revealing a rich history that reaches back to a time before humans settled the island and extends to the present day By ANDREW LAWLER Friday, April 03, 2015 Some six million years ago, in the middle of the North Pacific Ocean, volcanic activity bubbling up from deep beneath the Earth’s crust formed Kauai, the most ancient of Hawaii’s major islands.Over time, volcanoes dotting the island spewed magma that cooled and turned to igneous rock, forming steep mountains.There, everything from a 352,000-year-old lava flow to a Styrofoam cup washed in during a recent hurricane has been preserved.For the past quarter century, husband-and-wife paleoecologists David Burney and Lida Pigott Burney, along with dozens of colleagues and volunteers, have been digging down through the black mud that fills the sinkhole.

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Rainwater flowed down the mountains, and, as that runoff reached the Mahaulepu Valley on the island’s southeast coast, it encountered fossilized sand dunes, where, through a process called dissolution, a network of caves was formed.

For more than 100,000 years, groundwater seeped in and eroded the limestone.

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