giovedì 11 novembre 2010

Fossil Shark teeth, Approximately 1.25 inches long!!!





Shark teeth are embedded in the gums rather than directly affixed to the jaw, and are constantly replaced throughout life. Multiple rows of replacement teeth grow in a groove on the inside of the jaw and steadily move forward as in a "conveyor belt"; some sharks lose 30,000 or more teeth in their lifetime. The rate of tooth replacement varies from once every 8–10 days to several months. In most species teeth are replaced one at a time, except in cookiecutter sharks the entire row of teeth is replaced simultaneously.

24 commenti:

  1. I'd be more worried if they were 1.25 feet long.

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  2. dang those teeth would make short work of us monkeys

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  3. good info, will look forward to the next one

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  4. what the what?!? those things are huge! never seen any that size before!

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  5. interesting stuff, I'll check back tomorrow

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