Dating of volcanic ash

This mega-colossal eruption was the third - and largest - in the last million years at Toba, and the most explosive on Earth for more than two million years.

Despite being 100-times smaller in magnitude than Toba, Tambora led to a global drop in temperature of about 0.7 ºC and disastrous crop failures across the Northern Hemisphere the following year - dubbed “the year without a summer”.Much remains to be understood about the aftermath of this exceptional geological event, but at least we now know when it happened - to within a few centuries - and can use its ash and chemical remnants to tie together diverse records of global climate, ecology and human evolution.Volcanic ash plume from Cleveland Volcano, located on Chuginadak Island in the Aleutian Island Chain off Alaska.Argon dating by this method can help refine the time scale of physical and biological evolution over the past 100,000 years.University of Wollongong provides funding as a member of The Conversation AU.

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The upper boundary of the region is an isochron matching the 14C-derived age of the eruption.

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