IAS (Admin.) Mains Geography Physical Setting- India-Structure and Relief Study Material (Page 11 of 11)

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Precambrian, Paleozoic & Mesozoic Era

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Precambrian Era (Eozoic)

  • This is the oldest era of geological history. The duration of this era is from the beginning of the earth nearly 4.6 billion years or more till about 0.6 billion years ago. In other words, Pre-Cambrian alone compasses 90 per cent of all geological time. Pre-Cambrian rocks are, which are said to be the oldest one, belong to the Archaean period.
  • Most part of the Peninsular plateau of India is composed of Archaean rocks which include the rocks of the Dharwar system which were originally sedimentaries. Just above the Archae…

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Cenozoic Era

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This latest era in the earth՚s geological history has begun about 65 million years ago. Cenozoic is normally divided into two periods-Tertiary and Quaternary. Tertiary period ended about one million years ago. At present we are living in the Quaternary period.

Tertiary Period

The Tertiary period is sub-divided into five epochs. These are, beginning from the oldest, - Paleocene, Eocene, Oligocene, Miocene, and Pliocene.

  • Paleocene Epoch: This epoch began 70 million years ago and ended 60 million year…

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