The evidence of the 4,200-year climate event has been found in seven countries, namely Egypt, Greece, Syria, Palestine, Mesopotamia the Indus Valley, and the Yangtze River Valley.
The lower boundary of the Meghalayan stage defined at a particular level in a stalagmite from a cave in Northeast India.
Stanley Finney, a Professor at Long Beach State University in the US and Secretery General of the International Union of Geological Sciences (IUGS) in France said that “Meghalayan Age is unique among the many intervals of the Geologic Time Scale in that its beginning coincides with a global event produced by a global climate event”.
The other two ages are the Middle Holocene Northgrippian Age and the Early Holocene Greenlandian Age defined at climate events that happened about 8,300 years and 11,700 years ago respectively. All the three ages comprise the Holocene Epoch, which represents the time since the end of the last Ice Age.