Gelogical Time Scale India YouTube Lecture Handouts

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Geological Time Scale - India

4 eras include Precambrian, Paleozoic, Mesozoic and Cenozoic. 10 periods explained are Quaternary, Tertiary, Carboniferous, Gondwana, Upper & Lower Paleozoic, Vindhyan, Cuddapah, Dharwar and Archean.

• Documents intervals of geologic time relative to one another
• Continuously developed and updated
• Relative dating of periods in Earth՚s history
• Divided on the basis of the earth՚s biotic composition
• Phanerozoic Eon (i.e.. the Paleozoic, Mesozoic and Cenozoic Eras) : Earth՚s with advanced life forms
  • Fossils appeared in an orderly fashion in stratigraphic units.
  • Majority of fossil organisms did not match modern groups
  • Three major eras:
    • Paleozoic (meaning ancient life)
    • Mesozoic (meaning middle life)
    • Cenozoic (meaning recent life)
• Pre Cambrian (or Proterozoic and Hadean Eras) : Before advanced life.
• The modern Geologic Time Scale as shown above is a compendium of both relative and absolute age dating and represents the most up-to-date assessment of Earth՚s history.

✍ Manishika