Quote:
Originally Posted by nynor
"More than 1,000 years ago, the volcano erupted, and it was one of the largest ever recorded. Rock and magma emerged, and a layer of ash covered much of the region."
recorded by who/what? i love that kind of reporting.... LOL!
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D, they look at the sediment of the surrounding area. They can date the sediment layers and estimate the date it happened. That is the basics of geology. They may well have records from the Chinese. There are records from 240 BC from Chinese, Babylonian sources of Haley's Comet. Obviously they did not know we would name it after a scientist that was not born until 1656.