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The Geologic Time Scale (Chronological Order)

Detailed description on the chronology of the earth. reported are the very good source of information

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The Geologic Time Scale (Chronological Order)

  1. 1. Jason John V. Tabujara BSEdGS IV STA RT
  2. 2. WHAT IS A GEOLOGIC TIME SCALE? System of chronologic measurement relating to stratigraphy to time that is used by geologist and other earth scientists
  3. 3. INTRODUCTION TO CONCEPT: The period is the basic unit of geological time in which a single type of rock system is formed. Two or more periods comprise a geological Era. Two or more Eras form an Eon, the largest division of geologic time. Some periods are divided into epochs. The major periods in the geologic history of the Earth are (mya=million years ago):
  4. 4. INTRODUCTION TO CONCEPT: Eon Era Period Epoch Period Era Period
  5. 5. Hadean, Archean and Proterozoic Eons
  6. 6. PRECAMBRIAN Hadean Eon 4.6 to 3.9 billion years ago “Rockless Eon" - The solidifying of the Earth's continental and oceanic crusts. Archeozoic Eon (Archean) 3.9 to 2.5 billion years ago "Ancient Life" The first life forms evolve Proterozoic Eon 2.5 billion years ago to 540 mya *multi-celled, animals appear, including sponges. *Single supercontinent called Rodinia. *First multicellular life: colonial algae and soft-bodied invertebrates appear.
  7. 7. Paleozoic Era
  8. 8. PHANEROZOIC EON Paleozoic Era: The Paleozoic is bracketed by two of the most important events in the history of animal life. 1. Multicellular animals went dramatic diversity explosion 2. Largest Mass extinction of mostly 90% of marine organisms
  9. 9. PALEOZOIC ERA Cambrian Period "The Age of Trilobites" 540 to 500 mya
  10. 10. PALEOZOIC ERA Ordovician Period 505 to 438 mya
  11. 11. PALEOZOIC ERA Silurian Period 438 to 408 mya
  12. 12. PALEOZOIC ERA Devonian Period "The Age of Fishes" 408 to 360 mya
  13. 13. PALEOZOIC ERA Carboniferous Mississippian Period 360 to 325 mya
  14. 14. PALEOZOIC ERA Carboniferous Pennyslvanian Period 325 to 280 mya
  15. 15. PALEOZOIC ERA Permian Period "The Age of Amphibians" 280 to 248 mya
  16. 16. Mesozoic Era
  17. 17. PHANEROZOIC EON Mesozoic Era: Many of the Old life forms had just gone extinct in the Permian Extinction, the world’s largest mass extinction. Depleted state was followed by an explosion of new life forms such as dinosaurs, mammals, birds and flowering plants
  18. 18. MESOZOIC ERA Triassic Period 248 to 208 mya
  19. 19. MESOZOIC ERA Jurassic Period 208 to 146 mya
  20. 20. MESOZOIC ERA Cretaceous Period 146 to 65 mya
  21. 21. Cenozoic Era
  22. 22. PHANEROZOIC EON Cenozoic Era: The most recent Era of the three major subdivisions of animal history. Also called as the Age of Mammals 65.5 million years ago to present

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Detailed description on the chronology of the earth. reported are the very good source of information

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