UPSC geology - Geography Ebooks | TheGeoecologist

Question 1

What are the four eons of the geological time scale in chronological order?

Accepted Answer

The four eons in chronological order are: Hadean (4.6–4.0 Ga), Archean (4.0–2.5 Ga), Proterozoic (2.5 Ga–541 Ma), and Phanerozoic (541 Ma–present).

Question 2

Which mass extinction was the most severe in Earth's history?

Accepted Answer

The Permian-Triassic extinction (252 Ma), known as the 'Great Dying,' was the most severe, eliminating approximately 96% of marine species and 70% of terrestrial vertebrates.

Question 3

Is the Anthropocene officially part of the geological time scale?

Accepted Answer

As of 2024, the Anthropocene has not been formally ratified as a new epoch by the International Commission on Stratigraphy (ICS), though the Anthropocene Working Group has recommended its recognition starting circa 1950 CE based on radionuclide markers.

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Geological Time Scale: Earth’s History & Mass Extinctions Guide