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Is this a fossil or a rock???


Idelond

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Hey y'all.... Another piece from Peace River, Florida...  Is this a fossil or a rock???  Is very heavy and dense...  Thank u all for ur time

 

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Dugong rib section, is my thought.

  • I Agree 3

    Tim    VETERAN SHALE SPLITTER

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I agree with Tim, a section of dugong rib.

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Thanks everyone.... I thought it was dugong rib too from my books.... But wanted to make sure cause it's so heavy and dense...

Thank u all again for ur time...  Check out my other posts for more pieces from Peace River, Florida....  =)

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Hi Idelond,

being heavy and dense is typical for dugong ribs, they do not have the spongiosa-filled core of most mammal ribs. That helps the animal staying submerged in spite of all the fat that would make it float otherwise. Its called https://en.wikipedia.org/wiki/Pachyosteosclerosis and a very useful marker for aquatically adapted animals. Getting fossilized increases the density in most cases, so a fossil dugong rib is as dense as your average stone, a non fossil one not that much lighter.

Best Regards,

J

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24 minutes ago, Mahnmut said:

Hi Idelond,

being heavy and dense is typical for dugong ribs, they do not have the spongiosa-filled core of most mammal ribs. That helps the animal staying submerged in spite of all the fat that would make it float otherwise. Its called https://en.wikipedia.org/wiki/Pachyosteosclerosis and a very useful marker for aquatically adapted animals. Getting fossilized increases the density in most cases, so a fossil dugong rib is as dense as your average stone, a non fossil one not that much lighter.

Best Regards,

J

Thank u..... I'm new to fossils but I Love it....  I just learned something new... Actually I have two more pieces that now I'm almost sure is dugong ribs...  =)

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Cetacean ribs are similar, but tend to be heavier on the ventral side of the animal.

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