Prehistory & early life2  Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era
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Prehistory & early life2 Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era

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Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era

Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era

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Prehistory & early life2  Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era Prehistory & early life2 Notes on the geologic & life history of Earth from Precambrian to the present Cenozoic Era Presentation Transcript

  • EARTH’s HISTORY: ppt. by Robin D. Seamon Resource: TEXTBOOK: Prentice Hall Earth Science notes http://home.earthlink.net/~tranqbase/images/fossils.jpg
  • Geologic Time Scale
  •  
  • Precambrian Time: Vast and Puzzling
    • 4.5 Billion years ago to the Cambrian Period
    • Precambrian Rocks:
    • * shields are large, flat, ancient metamorphic rocks
    • * ores mined from shields tell us about Earth’s early history
    • Atmosphere: water vapor, CO 2 , Nitrogen, NO OXYGEN
    • Later, primary plants evolved, used photosynthesis which created oxygen
    • Oxygen accumulates 2.5 bya
  • Precambrian Time: Vast and Puzzling
    • Fossils:
    • * stromatolites : layered mounds and columns of calcium carbonate (material deposited by algae)
    • * chert : hard sedimentary rocks holding these fossils
  • Remnants of Precambrian Rocks
    • After Precambrian Era , time is divided into 3 other eras:
    • * Paleozoic Era
    • (Invertebrates Fish Amphibians)
    • * Mesozoic Era
    • * Cenozoic Era
  • Early Paleozoic Era: Life Evolves
    • 540 mya
    • Divided into 6 time periods:
    • * Cambrian Period
    • * Ordovician Period
    • * Silurian Period
    • * Devonian Period
    • * Carboniferous Period
    • * Permian Period
    • Paleozoic Era
    • LIFE EVOLVES
    • early life began in the seas
    • shells, trilobites
  • Early Paleozoic Era: Life Evolves two main land masses: * Gondwana ( S. Amer, Africa, Australia, Antarctica, Asia) * Laurasia (N. Amer, Eurasia) These two combined to form Pangea at the end of the Paleozoic era.
  •  
  • Periods of the Paleozoic Era Cambrian Period : “Age of Invertebrates” first organisms with shells, trilobites dominate Ordovician Period : first fish Silurian Period : “Age of Fishes” first land plants Devonian Period : fish dominate, first insect fossils Carboniferous Period: “Age of Amphibians” amphibians abundant, large coal swamps, Permian Period : extinction trilobites & other marine animals; first reptiles ppt LINK ppt LINK ppt LINK
  • Late Paleozoic Era
    • At the end of the Paleozoic Era, (400mya) plants adapted to water’s edge to inland
    • Amphibians diversified
    • Greatest of 5 mass extinctions
    • Climate became seasonal… led to extinction of many species
    ADVANCE
  • Silurian Period BACK
  • BACK Ordovician Period
  • Armor-Plated Fish BACK
  • Model of a Pennsylvanian Coal Swamp BACK
  • Permian Period Reptiles ADVANCE
  • Mesozoic Era: “Age of Reptiles”
    • 350 mya
    • Divided into 3 time periods:
    • * Triassic Period
    • * Jurassic Period
    • * Cretaceous Period
    • Dinosaurs were land-dwelling reptiles that were dominate during Mesozoic Era
    • Major event: breakup of Pangea
  • Mesozoic Era: “Age of Reptiles”
    • Life:
    • * gymnosperms
    • * Canadian Rockies formed
    • * shelled egg: adaptation favoring land birth IMPORTANT EVOLUTIONARY STEP
    • * Reptiles dominate
    ADVANCE
  • BACK
  • The Flying Reptile Pteranodon ADVANCE
  • Fossil Skull of an Extinct Crocodile
  • Periods of the Mesozoic Era Triassic Period “Age of Reptiles” Dinosaurs dominate Jurassic Period First birds, dinosaurs dominate Cretaceous Period First angiosperms (flowering plants) ADVANCE
  • Jurassic Period BACK
  • Cretaceous Period
  • MASS EXTINCTION!!! K-T Boundary- Earth struck by 6-mile wide asteroid, resulting in mass extinction: 65 mya End of the Mesozoic Era: Badlands, SD
  • Cenozoic Era: “Age of Mammals”
    • 65 mya
    • Considered the “Age of Mammals”
    • Divided into two periods
    • * Tertiary Period
    • * Quaternary Period
    • Plate movement led to much mountain building, volcanism, earthquakes
  • Cenozoic Era: “Age of Mammals”
    • Angiosperms replace gymnosperms as dominate land plants
    • Mammals (animals that bear live young, maintain steady body temperature) replace reptiles as dominate animal
    • adaptations such as insulating body hair, more efficient heart & lungs, allow mammals to lead more active lives
  • Fossils from La Brea Tar Pits
  • Cenozoic Era: “Age of Mammals”
    • Life
    • Large mammals & extinction: * In N. America, mastodon & mammoth (huge relatives of elephant), saber-toothed cats, giant beavers, large ground sloths, horses, camels, giant bison become extinct
    • ???? WHY???
  • Cenozoic Era: “Age of Mammals” Mastadon Wooly mammoth
  • Cenozoic Era: “Age of Mammals” Saber-toothed tiger Giant ground sloth
  • Cenozoic Era: Human Ancestors 2 mya – 10mya humans?
  • Reader’s Theater: North American History Character LINK Script LINK
  • LAB: Geologic Beaded Timeline
  • LAB Activity: Group Timeline Project Precambrian Paleozoic Mesozoic Cenozoic Cambrian Your timeline should include in pictures and words the following: (use color) Time ( - ) Era _____________, “Age of _________” Period Geology Atmosphere & weather *New adaptations plants, animals Extinctions?
  • COMPUTER LAB Activity: Geologic Timeline in Excel LINK
  • RESOURCE:
    • TEXTBOOK: Prentice Hall Earth Science notes 6 th grade