These divisions in Earth’s geological timescale demarcate key geologic events and the appearance (or disappearance) of notable forms of life. The Precambrian Era began 4.6 billion years ago, with the formation of our planet and the emergence of the first life forms. The Palaeozoic Era lasted from 541 million to 252 million years ago, and was characterised by the evolution of complex life, including fish, plants, insects, and amphibians. The Mesozoic Era came next, lasting from 252 million years until 66 million years ago. Finally came the Cenozoic Era, which began 66 million years ago and continues to this day, distinguished by the rise of modern animals.

Source: The Hindu July 25, 2023 18:50 UTC