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galaxy777

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Ok, this fossil has me puzzled. It was found in Bois D Arc creek in Bonham; Fannin Co. Texas. Forgive me for not knowing much of the geological info on Fannin Co. Texas, but I think it's in the Austin Group, Late Cretaceous.

 

This piece looks like skin. Veining in sections, and a complex structure all the way through.
 

About 1 1/4" long.

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Looks like fossil cartilage,  to me. :unsure: 

    Tim    -  VETERAN SHALE SPLITTER

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Shark cartilage from a post here on the Forum

 

gallery_907_308_4622.jpg

    Tim    -  VETERAN SHALE SPLITTER

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"In every walk with nature one receives far more than he seeks."

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OP's Pictures, brightened, contrasted and cropped.

 

 

DSCN2879.JPG.7d1d71342cf1a644b1a5d4e16fdeba6a.JPG   DSCN2880.JPG.a985fa4b967266a1ab2d2444a6c22cd2.JPG    DSCN2883.JPG.424f0d86f0294ba3234e0ab130defe48.JPG

 

 

skin.jpg.6335e8b78cd88303f6758f6a217263d4.jpg          skin1.jpg.81ea97debfbe79538896115b704ac0f9.jpg        skin2.jpg.555ae0065395bbb0f1c086f99ac7ae9d.jpg

 

 

skin3.jpg.b6866b6f05998b0b62c3e20c2b047b29.jpg

    Tim    -  VETERAN SHALE SPLITTER

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"In every walk with nature one receives far more than he seeks."

John Muir ~ ~ ~ ~   ><))))( *>  About Me      

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It sure does kinda look like shark cartilage.  My only concern is this view in cross section that looks like coral.  I'm not familiar enough with shark cartilage in cross-section to comment.

Screenshot_2017-02-20-15-49-35-1.thumb.png.1687b27bde673df3237f1fc4d623d173.png

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I think it's just an interesting rock. I've hunted points on that creek many times and see very few fossils. 

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Maybe @Carl will chime in. :) 

    Tim    -  VETERAN SHALE SPLITTER

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__________________________________________________
"In every walk with nature one receives far more than he seeks."

John Muir ~ ~ ~ ~   ><))))( *>  About Me      

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The polygonal shapes seem to be the positive structural element rather than positive relief tesserae and there does appear to be tabulae in cross section. I'm swinging with silicified coral..Never having found shark cartilage I may be biased...

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Bois d' arc Creek cuts through some middle and upper Cretaceous formations like eagle Ford, Bonham and Brownstone. The only corals I find there are horn corals but there may be others. Some shark cartilage has been found in the area and I think that's what you have. Beautiful colors!

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I haven't see the equivalent of your piece on that site, but you might like to visit it : http://www.northtexasfossils.com/

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"On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry)

"We only well see with the heart, the essential is invisible for the eyes."

 

In memory of Doren

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4 hours ago, Al Dente said:

Tabulate coral, probably Favosites. It looks silicified.

Can Tabulate corals be found in the Cretaceous?

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I am fairly confident this is eroded piece of the Upper Cretaceous rudist, Durania.

 

Here is quick shot that shows the similar characteristics.

IMG_2495.JPG

 

The human mind has the ability to believe anything is true.  -  JJ

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6 hours ago, BobWill said:

Can Tabulate corals be found in the Cretaceous?

 

No. I think JohnJ is probably correct with rudist unless this piece was brought into the area from somewhere else.

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I was firmly in the favositid camp until i saw JohnJ's post. I don't know my rudists but this certainly makes the most sense. There are a few details that sway me far from cartilage.

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Rudists have also been found in this area but, like Carl, I don't know them well and they come in many odd forms. This site is near the NSR and I see in the Fossil Collectors Guide to the North Sulphur River there have been two found there, Sauvagesia belti, & Durania (Radiolites) austinensis. The text says they are often mistaken for colonial coral. This makes a lot more sense than cartilage. 

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A couple of things could influence the color of this find.  Fire could give this material a reddish color; but more likely the color comes from iron leached from decomposing pyrite (which is common in the formations where Durania are found).

 

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The human mind has the ability to believe anything is true.  -  JJ

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Glad we have locals to set the record straight. :blush::) 

    Tim    -  VETERAN SHALE SPLITTER

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__________________________________________________
"In every walk with nature one receives far more than he seeks."

John Muir ~ ~ ~ ~   ><))))( *>  About Me      

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