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Geologic Time Scale

Geologic Time Scale. Chapter 2, Section 3 – Unit A Science 8 Messana. EONS – largest division of time. 1. Hadean 2. Archean 3. Proterozoic 4. Phanerozoic #1-3 make up Precambrian Time Eons -> Eras -> Periods -> Epochs Change in name is due major geologic or climatic events !!.

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Geologic Time Scale

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  1. Geologic Time Scale Chapter 2, Section 3 – Unit A Science 8 Messana

  2. EONS – largest division of time • 1. Hadean • 2. Archean • 3. Proterozoic • 4. Phanerozoic • #1-3 make up Precambrian Time • Eons -> Eras -> Periods -> Epochs • Change in name is due major geologic or climatic events!!

  3. PRECAMBRIAN TIME • 90% of Earth’s history • Lasted nearly 4 billion years of Earth’s 4.6 billion years • Volcanic ash & dust ->clouds formed ->rain • Single-celled micro-organisms in ocean at end • No animals! • No plants!

  4. Phanerozoic Eon • 544 million years ago – present • Explosion of Life! • 3 Eras: • Paleozoic Era – “Age of Amphibians” • Mesozoic Era – “Age of Dinosaurs” • Cenozoic Era – “Age of Mammals”

  5. Paleozoic Era = “Ancient” • 544 mya – 248 mya • All life in ocean until end • Fish developed • Reptiles, Insects, Ferns developed – moving life onto land at end • Ends with a Mass Extinction (from a meteor strike?)– kills 90% of all ocean species

  6. Mesozoic Era = “Middle” • 248 mya – 65 mya • Dinosaurs rule! • Small mammals, birds, flowering plants • Ends with Mass Extinction due to meteor strike off Mexico ->dust cloud blocked sunlight, killed plant life and affected food chain

  7. Cenozoic Era =“Recent” • 65 mya – Present • Large warm-blooded mammals, modern birds, flowering plants • Animals developed migration techniques • Tertiary Period • Quaternary Period = last 2 million yrs • Ice ages • 1st modern human fossils = 100,000 yrs old • Humans are 7 seconds of 12 hour clock!!

  8. Theory of Uniformitarianism • Earth is constantly changing due to the same basic forces • EX: Slow = erosion, plate movement Fast = volcano, earthquake

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