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Overview of Earth's History: from Hadean to Cenozoic Era

This lecture provides an overview of Earth's history, including the Hadean era, Archean era, Proterozoic era, Paleozoic era, Mesozoic era, and Cenozoic era. It covers topics such as the formation of the Earth, the impact that formed the Moon, asteroid bombardment, the origins of life, major geological events, the development of complex organisms, the formation of continents, extinction events, and the dominance of mammals and flowering plants in the Cenozoic era.

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Overview of Earth's History: from Hadean to Cenozoic Era

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  1. Lecture 13 Overview of Earth’s History Hadean (4.5 to 4.0 Ga.) 1. Initial Formation of the Earth 2. Impact of Mars-sized planet - Formation of Moon

  2. 3. Era of Asteriodal Bombardment (4.1 to 4.5 Ga.) • The evidence?

  3. Archean (2.5 to 4.0 Ga.) 1. Formation of First Stable Crust 2. The Archean Atmosphere 3. The Origins of Life - Oldest Fossil – 3.7 Ga. What was the Archean world like?

  4. Stromatolite Primitive Unicellular Organisms

  5. Proterozoic (0.54 Ma to 2.5 Ga.) 1. Compare Archean and Proterozoic Sedimentary Rocks - The Early Proterozoic is the first period of large- scale stability (2.5 Ga.)

  6. 2. The Biggest Pollution Event of the Earth - At about 2.2 to 2.0 Ga. sediment deposited on land develops a red color. Before that only oceans sediment was red 3. The presence of oxygen supported the development of more complex organisms (1.2 Ga.) Eukaryotes versus prokaryotes 4. Snowball Earth (600 to 700 Ma.) - Strange Climatic Conditions - The Entire Earth Froze-up

  7. 5. The Origin of Animals (≈ 600 Ma.) • First Animals Lack Durable Hard Parts • Fossil Evidence is Indirect • - Called Trace Fossils

  8. Paleozoic (250 to 540 Ma.) - Early Paleozoic (420 to 540 Ma.) 1. Origin of Animals with Skeletal Hard Parts

  9. During the Early Paleozoic a rich diversity of sea life existed Q: What is missing in this photo?

  10. 2. The continents are not fixed. They move - But, very slowly

  11. Late Paleozoic (250 to 420 Ma.) • 3. Origin of Terrestrial Life • Toward the end of the Paleozoic • large forests consisting of fern • trees were established • These swampy forests ultimately • generated most of the world’s coal

  12. Also during the Late Paleozoic land animals evolved Insects Amphibians Reptiles

  13. 4. Also toward the end of the Late Paleozoic all of the continents were assembled to form the supercontinent Pangaea Gradual movement of continents over geologic time is called continental drift. 5. Permian Extinction

  14. Mesozoic (66 to 250 Ma.) 1. Break-up of Pangaea - The result: Formation of the Atlantic Ocean 2. In terms of life this era is known as the Age of the Dinosaurs

  15. 3. During the Mesozoic other lifeforms developed ________________ _____________________

  16. 4. What happened at the end of the Mesozoic?? What caused the extinction of the dinosaurs?

  17. The big one? An impact of a Comet or Asteriod

  18. Where did this asteroid impact?

  19. Cenozoic (0 to 66 Ma.) 1. Global Cenozoic Plate Tectonics - The Mesozoic was a period in which continents were in general moving away from one another - Exception: collision of India with Eurasia 2. The Mediterranean Basin about 6 to 7 Ma. ago 3. Cenozoic Life Mammals and flowering plants become dominant

  20. 4. The Quaternary “Ice Age” (0 to 2 Ma.) - Climate variability is the norm Glacial versus interglacial periods - The Quaternary glacial periods has it roots in the development of ice sheets at south pole over 30 m.y. - In summary when looking at earth’s history as a whole ice sheets are rare even at the poles except during the last 30 m.y.

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