U.S. Geologists Discover Preglacial Terrain Supporting Evidence for Greenland’s Past

U.S. Geologists Discover Preglacial Terrain Supporting Evidence for Greenland’s

A preglacial tundra landscape preserved for 2.7 million years far below Greenland glaciers has been discovered by U. S. geologists. The findings have been released on analyzing 17 samples extracted from the ice sheet in 1993 from Summit, Greenland.

On analyzing pollen and plant DNA buried in the seafloor offshore Greenland also suggested that the island once used to have tundra and patchy forest similar to that of today's high Arctic. Preglacial tundra is the region buried thousands of feet under the Greenland Summit, highest point on Greenland's ice sheet, and is an area born before humans ever walked on earth.

The results seem to be surprising as they found preglacial tundra in perfect condition at depth of two miles below ice covering.

Generally, glaciers vanish of everything from any plot to top layer bedrock. Paul Bierman, University of Vermont geologist, said the findings supports the fact that ice sheets have survived numerous global warming episodes.

Paul added that the ice covering acts as refrigerator for the preglacial tundra and thus preserved the landscape by being frozen.

Bierman and his colleagues collected samples of sediment locked in the frozen ice and applied geochemical technique, called beryllium-10 dating, to gain insight into history of sediments. Counting number of beryllium-10 isotopes helps researchers measure age of landscapes because the isotopes only form in rocks and soil exposed at the surface.

The ice sheets did not caused modification through millions of years of changing temperatures and sealed the tundra landscape. The findings hold strong evidence that the center of Greenland was stable and did not melt fully even during the warmest periods of ice sheet's life.


User login



You May Have Missed...

NPD Group: Nintendo 3DS handheld topped hardware and software sales charts in Ju
Fri, 08/19/2016 - 10:47

According to the latest statistics released by the analysis firm NPD Group, Nintendo’s 3DS handheld gaming console bagged the top-notch position...


Nigeria Update

Fresh Polio Cases lead to WHO Travel Restrictions on Pakistan and Syria
Tue, 05/06/2014 - 00:45

World Health Organization has slapped international travel restrictions on Pakistan, Cameroon...


Economy Watch

US Import Prices decline in April
Thu, 05/14/2015 - 01:13

For a straight 10th month, US import prices declined in April. The decline could be due to the...


Health Tonight

More than expected rise in US maternal death rate: Study
Tue, 08/09/2016 - 11:21

A rise has been witnessed in the US maternal death rate, women who die during or soon after...


UK News

How a Comet smells? Here’s a Perfume That Mimics the Smell
Wed, 06/29/2016 - 12:41

You may not be able to visit a comet in your life, but you can know how it smells. A British...


Pharmaceuticals

Aetna
Sat, 01/17/2015 - 06:04

Aetna inc., health care company, on Friday announced that it has signed a deal with Gilead...


US News


Technology Tonight

Twitter is reportedly readying Apple TV version of its app
Tue, 08/16/2016 - 11:41

In a Monday report, the New York Times said that popular microblogging service Twitter is...