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Is this a fossil or a rock???


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Idelond

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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Fossildude19

Dugong rib section, is my thought.

  • I Agree 3
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Thomas.Dodson

I agree with Tim, a section of dugong rib.

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Idelond

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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Mahnmut

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

  • I found this Informative 1
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Idelond
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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Rockwood

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

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