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Geological Time Scale

A very short (and largely photographic) presentation on the Geological Time-Scale

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Geological Time Scale

  1. 1. The Geological Time Scale (GTS) Bedashree Choudhury 14109MWS
  2. 2. What is it? a system of chronological measurement that relates stratigraphy to time, to describe the timing and relationships between events that have occurred throughout Earth's history. Who uses it? Geologists, paleontologists, archaeologists, anthropologists, and other Earth scientists.
  3. 3. Why do we need to know about it? History Important events Exploration Record Calendar Evolution Dating General knowledge Links; Chains
  4. 4. How does one construct a geological time scale? By studying rock layers [Stratigraphy] Mining Bottom-most layer = oldest; topmost layer = newest ← Principle of Uniformitarianism (geology) Fossils, artifacts, ecofacts, biofacts; evidence in the different layers
  5. 5. Segments of rock (strata) in chronostratigraphy Units Time spans in geochronology Notes to geochronological units Eonothem Eon Half a billion years or more Erathem Era Several hundred million years System Period Few hundred million years Series Epoch Tens of millions of years Stage Age Millions of years
  6. 6. Age of the Earth : 4.54 ± 0.05 billion years
  7. 7. Comparatively...
  8. 8. Major extinction events ( The “Big Five”)
  9. 9. en.wikipedia.org

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