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Educating Tong: Science Explains Pattern of Gaps

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    Tin: A combination of the evolutionary history of life and the basic scientific principles of fossilization and geology explain the nature of fossil gaps. The
    Message 1 of 1 , Jan 5, 2013
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      Tin: A combination of the evolutionary
      history of life and the basic scientific
      principles of fossilization and geology
      explain the nature of fossil gaps.


      The following principles impact
      the likelihood that any form of life
      will fossilize and be found. OTHER
      THINGS BEING EQUAL, the following explain
      patterns of gaps in the fossil record
      in general and Cambrian (relatively large gaps)
      in particular.


      A. Fossilization is rare. Most life does not
      fossilize.


      B. Small physical size (contrast to hominids
      for example). Fossil gaps are larger for
      smaller organisms and smaller for large organisms
      other things being
      equal.


      C. Lacking in hard parts (the fossil record
      becomes almost instantly richer once shells evolve).
      Fossil gaps are larger for organisms lacking hard
      parts and smaller for organisms with hard parts
      other things being equal.


      D. Species that lived for a short
      time are(some evolutionary transitions were
      geologically brief, providing only a short
      window for fossilization) . Other
      things being equal there are fewer fossil
      for life forms that lived only a short
      time.


      E. Absence of fossilization conditions
      (special circumstances are required for
      fossilization to occur, the vast majority of
      life is NOT fossilized). Some environments
      are more conducive to fossilization than
      others. Areas with frequent local floods,
      tar pits, volcanic ash, or landslides
      can inrease the chances of fossilization.


      F. Destruction of fossils (plate tectonics,
      erosion, human activity). Fossilization
      that occurs near subduction zones may
      result in the destruction of the fossils
      via subduction.


      G. Age: very old fossils are more likely
      to be destroyed. Other things being
      equal there are more gaps for ancient life
      froms than more recent life forms.


      H: Quantity of individuals. The volume of
      individual organisms both horizontally
      and vertically in the geologic column impact
      the probability of life fossilizing and being found.
      For example, bacteria live in large numbers, sometimes
      clumped together, geographically diverse in locations
      over billions of years.
      -----




      Science and evolution EXPLAIN
      fossil record pattern. ID never does.
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