Which one of the following is the oldest era in Geological History det

Which one of the following is the oldest era in Geological History determining the age of various rock types ?

Precambrian

Mesozoic

Cenozoic

Paleozoic

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UPSC NDA-2 – 2023

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In the geological timescale, the largest division is the Eon. The history of the Earth is divided into four eons: Hadean, Archean, Proterozoic, and Phanerozoic. The first three eons together are often informally referred to as the Precambrian Supereon, preceding the Phanerozoic. The Phanerozoic Eon is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. The Precambrian represents the vast majority of Earth’s history, from its formation about 4.5 billion years ago until the beginning of the Paleozoic era about 541 million years ago. Therefore, the Precambrian is the oldest era (or supereon encompassing the oldest eras) listed.

The Precambrian Supereon, comprising the Hadean, Archean, and Proterozoic Eons, represents the oldest and longest interval in Earth’s geological history, preceding the Phanerozoic Eon and its subdivisions (Paleozoic, Mesozoic, Cenozoic Eras).

The Paleozoic Era saw the “Cambrian explosion” of life, the Mesozoic is known as the age of dinosaurs, and the Cenozoic is the current era, known as the age of mammals. These are all significantly younger than the Precambrian.

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