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Still Waters

Antarctica: 2.7-million-yr-old ice core found

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A team of researchers from Princeton University, the Scripps Institution of Oceanography, the University of Maine and Oregon State University has drilled and retrieved a 2.7-million-year-old ice core from a spot in Antarctica.

Until recently, scientists believed that ice core samples taken from either pole had an age limit of approximately 800,000 years—this was because ice at the bottom melted due to heat from inside the Earth. But a team at Princeton discovered a few year ago that another type of ice could hold much older ice known as blue ice. It forms on glaciers due to snowfall which, over time, becomes compressed, squeezing out air bubbles, making the ice look blue. But it also has another characteristic—over time, the ice at the bottom is pushed upwards, protecting it from melting. In this new effort, the team drilled at a site called the Allan Hills, near McMurdo Station.

https://phys.org/news/2017-08-million-year-old-ice-core-antarctica.html

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Very interesting Read!

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