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The ocean floor near the base of rivers

  1. Apr 17, 2005 #1
    When I look at a map which shows the sea floors I see canons at the base of large rivers which tend to fork out and travel long across the ocean floor. It looks very much like they were carved by the river. What are these and what caused them?
  2. jcsd
  3. Apr 17, 2005 #2
    Yes You're right indeed. Would it be an idea that those ocean floors were above sealevel in the geologic past?
  4. Apr 17, 2005 #3


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    The other main theory is that turbitidy currents (underwater landslides) are mainly responsible for their erosion, as some extend far deeper then sea level has ever been known to fall to during ice ages (3000m below the surface). In reality, a combination of the two may be responsible.

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