Geoscience Reference
In-Depth Information
Asian monsoon is stronger, and conversely. One unprecedented event was the 74 ka
eruption of Toba volcano in Sumatra, which also left India covered in a blanket of
volcanic ash 10-15 cm deep. The climatic impact of this eruption, which was the
largest eruption of at least the last 1 million years, is still in dispute. Pollen and carbon
isotopic evidence suggests a change in plant cover over north-central India, with forest
prevalent before and grassland and open woodland prevalent after the eruption. It is
still not clear what effect this event had on humans and other organisms away from
the immediate site of the eruption.
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