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Henry Tse
20180307_185627.jpg  20180307_185640.jpg  20180307_185646.jpg  20180307_185710.jpg  20180307_185803.jpg  20180307_185657.jpg 

Hello,
I am new to the forum and I am not sure if I am doing this correctly. Anyways, I had totally forgotten about this until it found it on the ground in my shed. It was a gift I received from my aunt in Florida when I was little. She got it from her husband who works in a phosphate mine near their home. I have no clue what it is. It is about one foot long. Note: the lines that look like veins that run along it are from its stay in the shed.
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prep01
Hi and welcome to the forum. I think this is part of a burrow made by a crustacean.
Colin Huller
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Arthur1
I know very little but when I googled Florida Phosphate fossil I came up with a picture which looked like your fossil which said it was a :

SAWSHARK FOSSIL TOOTH PRISTIS SAWFISH

Here is the link:

https://www.paleodirect.com/mvx004-large-pristis-sawfish-rostral-tooth-from-the-bone-valley-formation-of-florida/
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Arthur1
I’m sure prep01 is nearer the mark !!
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prep01
Arthur1 - I think it's a wee bit too big at 300mm as opposed to 55mm!
Colin Huller
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Arthur1
I missed that !!!
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Henry Tse
Hello again,

Thank you all for your thoughts. I agree with prep01 that it is quite a bit larger than what Arthur1 described. I don't however think it is a crustacean burrow, it is porous and looks like bone. i did a little poking around and found that it could be a rib tip of some sort. I would really appreciate some more input. Thank you again. 
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andrasz
Possible sirenian (sea cow) rib, really hard to tell from the photo.
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henryrb
Not bone, I do not see a hollow structure I agree with prep01 [smile]  
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