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Tag: Younger Dryas

The high temperatures of the meteorite impact 12,900 years ago produced mm-sized spherules of melted glass with the mullite and corundum crystal structure shown here Photographed by: Mukul Sharma

Meteor impact in Canada may have triggered the Big Freeze that caused mass extinction and forced humans into agriculture

September 3, 2013

The high temperatures of the meteorite impact 12,900 years ago produced mm-sized spherules of melted glass with the mullite and ...

A new model of flood waters from melting of the Laurentide Ice Sheet and large glacial lakes along its edge that covered much of North America from the Arctic south to New England over 13,000 years ago, shows the meltwater flowed northwest into the Arctic first. This weakened deep ocean circulation and led to Earths last major cold period.The direction of meltwater drainage is shown by the yellow arrows. The approximate position of the ice sheet is shown (in white) just before the onset of the Younger Dryas. The ocean colors are surface salinity from the control integration with warm (cold) surface currents shown in red (blue). (c) Alan Condron, UMass Amhers

Trigger for Earth’s last ‘big freeze’ located by geoscientists

November 6, 2012

Some 12,900 years ago, a massive flood of melted freshwater in the Arctic caused a 1,200-year-long chill nicknamed the "Big ...

Scanning electron microscope image showing the ‘tectonic' effects of the collision of one spherule with another during the cosmic impact. (c) UCSB

Comet might have catastrophically collided with Earth 13,000 years ago

A recently published study suggests that the Earth might have been visited by a giant space rock 13,000 years ago, ...

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