Geologic time scale

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Geologic time scale

  1. 1. Geologic Time Scale (pg 6)
  2. 2. Geologic Time Scale (pg 6)• A timeline of Earth’s history
  3. 3. Geologic Time Scale (pg 6)• A timeline of Earth’s history• Based on both relative dating and absolute dating
  4. 4. Geologic Time Scale (pg 6)• A timeline of Earth’s history• Based on both relative dating and absolute dating• Divides time into eons, eras, and periods
  5. 5. Creating the Geologic Time Scale• The divisions are based on changes in the fossil record in different layers of rock
  6. 6. Creating the Geologic Time Scale• The divisions are based on changes in the fossil record in different layers of rock• Scientists use radiometric dating to determine the age of each rock layer
  7. 7. Eras1. Precambrian: Covers almost 90% of Earth’s history. Single-celled organisms
  8. 8. Eras1. Precambrian: Covers almost 90% of Earth’s history. Single-celled organisms2. Paleozoic: Animals and plants appear. This era begins with the “Cambrian explosion” with many strange new types of animals
  9. 9. Eras1. Precambrian: Covers almost 90% of Earth’s history. Single-celled organisms2. Paleozoic: Animals and plants appear. This era begins with the “Cambrian explosion” with many strange new types of animals3. Mesozoic: Dinosaurs, mammals, and flowering plants appear
  10. 10. Eras1. Precambrian: Covers almost 90% of Earth’s history. Single-celled organisms2. Paleozoic: Animals and plants appear. This era begins with the “Cambrian explosion” with many strange new types of animals3. Mesozoic: Dinosaurs, mammals, and flowering plants appear4. Cenozoic: Mammals become dominant

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