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October 27,2011

October 27,2011. Objective To learn how the geologic timeline was made and how the length of the various periods are different. Agenda Progress reports – need to be signed by Parent/guardian Geologic History Notes Project –highlights Lab: Geologic Timeline. Structure of the Time Scale.

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October 27,2011

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  1. October 27,2011

  2. Objective • To learn how the geologic timeline was made and how the length of the various periods are different • Agenda • Progress reports – need to be signed by Parent/guardian • Geologic History Notes • Project –highlights • Lab: Geologic Timeline

  3. Structure of the Time Scale The Geologic Time Scale  Based on their interpretations of the rock record, geologists have divided Earth’s 4.56-billion-year history into units that represent specific amounts of time. Taken together, these time spans make up the geologic time scale.

  4. Structure of the Time Scale 12.4 The Geologic Time Scale  Eons represent the greatest expanses of time. Eons are divided into eras. Each era is subdivided into periods. Finally, periods are divided into smaller units called epochs.  There are three eras within the Phanerozoic eon: the Paleozoic, which means “ancient life,” the Mesozoic, which means “middle life,” and the Cenozoic, which means “recent life.”

  5. The Geologic Time Scale

  6. Precambrian Era • The Precambrian era lasted from Earth’s formation 4570 until 542 million years ago (mya). • The first cells appeared in the Precambrian era.

  7. Paleozoic Era • The Paleozoic era lasted from 542 to 251 mya. • Paleozoic is a Greek word meaning “ancient life.”

  8. Paleozoic Era • Rocks from the Paleozoic Era contain fossils of snails, clams, corals, and trilobites.

  9. Animals with backbones began to appear. At the end of this era, the continents that existed during this time period collided to form a new supercontinent, Pangaea. Paleozoic Era

  10. Mesozoic Era • The Mesozoic era lasted from 251 to 65 mya. • This era is often called the Age of Reptiles.

  11. Cenozoic Era • The Cenozoic era began 65 mya and is still going on. • The common name for the Cenozoic Era is the Age of Mammals.

  12. Cenozoic Era • Mammals diversified into a variety of species including land mammals, sea mammals, and flying mammals. • Cenozoic means “recent life.”

  13. Mastadon • Stromatolites • Apatosaurus (Brontosaurus) • OrthocerasNautiloid • Eurypterids • Trilobites • Velociraptor • Chesapectenjeffersonius ( State Fossil) • CarcharodonMegalodon • Spinosaurus • Cave Bear (Ursusspeleaus) • Ichthyodectesctenodon • Coelophysis • Quagga • Giganotosaur • Ohmdenosaurus • Zephyrosaur • Wuerhosaurus • Torosauruslatus • Elasmosaurusplatyurus • Manny: woolly mammoth • Sid: ground sloth (Megalonyx) • Diego: saber-toothed tiger (Smilodon) • Scrat: saber-toothed squirrel (Leptictidium) • Dab: dodo • Carl: Embolotherium • Frank: Brontotherium

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