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Geologic Time: Understanding Earth’s Past

Historical Geology & Paleontology Earth’s History A story told in the rock layers But some chapters are missing 550 millions yrs. Ago to present. Geologic Time: Understanding Earth’s Past. Key “Principles” to Reading Earth’s Past Principle of Uniformity

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Geologic Time: Understanding Earth’s Past

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  1. Historical Geology & Paleontology • Earth’s History • A story told in the rock layers • But some chapters are missing • 550 millions yrs. Ago to present Geologic Time: Understanding Earth’s Past

  2. Key “Principles” to Reading Earth’s Past • Principle of Uniformity • Principle of Original Horizontality • Principle of Superposition • Principle of Crosscutting Relationships • Principal of Faunal Succession • Index fossils Geologic Time: Understanding Earth’s Past

  3. The Fossil Record • Methods of fossilization • Non-traditional methods • Frozen • Amber • Tar • Mineralization & replacement • Traditional methods • Cast & mold Geologic Time: Understanding Earth’s Past

  4. The Geologic Time Scale (Read from bottom up) • Era (3) • Periods (12) • Epochs (7) Geologic Time: Understanding Earth’s Past

  5. Eras • Cenozoic – recent life Youngest • Mesozoic – middle life • Paleozoic – ancient life Oldest Geologic Time: Understanding Earth’s Past

  6. Periods • Quaternary Youngest • Tertiary • Cretaceous • Jurassic • Triassic • Permian • Pennsylvanian • Mississippian • Devonian • Silurian • Ordovician • Cambrian Oldest Geologic Time: Understanding Earth’s Past

  7. Epochs • Recent Youngest • Pleistocene • Pliocene • Miocene • Oligocene • Eocene • Paleocene Oldest Geologic Time: Understanding Earth’s Past

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