Scientists have marked the time since the Earth began its life. They have divided it into different Epochs, Periods, Eras and Eons progressively in increasing time groups.
We are living in the following division of time.
Holocene epoch began roughly 11700 years back and continues till present. United States Geological Survey (USGS) has divided this time into three ages namely
Greenlandian: 11700 to 8326 years ago
Northgrippian: 8326 to 4250 years ago
MEGHALAYAN: 4250 to present date
MEGHALAYAN age marks the time when a mega drought devastated civilizations across the world, including those in Egypt, Greece, Syria, Palestine, Mesopotamia, The indus Valley and the Yangtze valley. Drought lasted some 209 years and supposed to be prompted by shifts in ocean and atmospheric circulation.
Geologists chose the name “Meghalayan” as a nod to a rock sample they analyzed from Meghalaya, a northeastern state in India, whose name means “the abode of clouds” in Sanskrit.
By analyzing a stalagmite growing on the ground of Mawmluh Cave, geologists found that each of the stalagmite layers had different levels of oxygen isotopes, or versions of oxygen with different numbers of neutrons. This change marked the weakening of monsoon conditions from that time.