WHAT IS GEOLOGICAL TIME?
The time recorded by written records of important events of human civilization is tiny compared to the total history of the planet, known as geological time. The enumeration of geologic time units by geologists, paleontologists, and other geoscientists takes place through the study of rock strata and their fossil forms. Scientists determine the time in which they were formed to understand the earth at that time. By and large, each geological time span is divided into different units based on the occurrence of unique plants and animals in their duration as well as on large evolutionary or extinction events. The longest unit of this geological time scale is known as eon. The entire age of the earth is divided into three formal and one informal eons.
HOW ARE THE EONS FURTHER DIVIDED?
The Aeon, a very long period of time, is divided into epochs that are further subdivided into periods. The periods are divided into epochs that are further subdivided into ages. This subdivision is made by examining the rocks formed during these periods and the fossil forms enclosed therein. The Phanerozoic Eon is divided into the Paleozoic (541
WHAT IS THE MEGHALAYAN AGE?
Due to the difference between the animal and plant forms that derive from them, geological periods are further subdivided into series (epochs), which in turn are divided into stages / ages. The Quaternary period is divided into two series (epochs) – the Pleistocene and the Holocene. The Holocene series, which covers about 11,700 years in the history of the earth, coincides with the late Stone Age. The Holocene series is divided into three phases, of which the Meghalayan Age is the last. It began 4,200 years ago when agricultural societies around the world experienced a sudden and critical mega-drought that led to the collapse of civilizations and migrations to Egypt, Greece, Syria, Palestine, Mesopotamia, the Indus Valley, and the Yangtze River valley ,
Source: Encyclopaedia Britannica, International Commission for Stratigraphy Research: Atul Thakur, Chart: Karthic R Iyer