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:earth_americas:Earth's History :earth_americas:, PERIOD, Mapping…

- - - - Longest - Era, Period, Epoch - Shortest
        
        ERA
        
        There are 3 different Eras that start after The Precambrian Times
        
        The Paleozoic Era (the oldest)
        
        544 mya - 245 mya
        
        2 more items...
        
        The Mesozoic Era (the middle)
        
        245 mya - 65 mya
        
        The Cenozoic Era (the most present)
        
        65 mya - Present Day
        
        EPOCH
        
        Epochs start from 66 mya - Present Day
        
        Tertiary Epochs
        Paleocene = 66 mya - 55.8 mya
        Eocene = 55.8 mya - 33.9 mya
        Oligocene = 33.9 mya - 23 mya
        Pilocene = 23 mya - 5.3 mya
        Miocene = 5.3 mya - 2.6 mya
        
        Quaternary Epochs
        Pleistocene = 2.6 mya - 11,700 ya
        Holocene = 11,700 ya - Present Day
        
        1 more item...
        
        Tertiary Epochs Major Events
        rise of mammals
        evolution of modern birds
        significant tectonic plate activity (forming of mountains)
        beginning of an Ice Age
        early hominids
        
        The timeline is broken up into Epochs, Periods, and Eras
        
        The Eras begin after The Precambrian Times
- - - - cooling
- - - - Law of Superposition In horizontal sedimentary rock layers (stratum), the oldest layer is at the bottom, while each layer is younger than the layers below it.
      - Law of Original Horizontality
        rock strata (plural of stratum) deposit in horizontal, flat layers. If the strata are not horizontal, an event occurred, such as movement of tectonic plates, which caused the layers to fold or tilt
      - Law of Cross-Cutting Relationships
        Any geologic feature that cuts across or disrupts another feature must be younger than the feature it cuts.
  - - - only works for igneous rocks and fossils
      - analyzes chemical properties of the rock/fossil
      - Zircon
        Uranium/Lead dating
        
        Potassium - Argon Dating
        (K - AR)
    - - When the atoms of one element break down to form another, different element, this is called radioactive decay
  - - - molds - a hallow area in a sediment in the shape of an organism or an ogranism
      - casts - a copy of the shape of an organism
  - - - Evolution
        
        our next unit :)