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galaxy777

Skin? Please help ID

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galaxy777

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.

DSCN2880.JPG

DSCN2883.JPG

DSCN2879.JPG

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galaxy777

Here are some close up images of the pattern.

skin.jpg

skin1.jpg

skin2.jpg

skin3.jpg

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Fossildude19

Looks like fossil cartilage,  to me. :unsure: 

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jhw

Hmm. interesting. Looks like a good possibility. For comparison:

fossil_shark_cartilage_zoomed_in.jpg

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Lone wolf

I  Believe it's coral.  Probably Devonian or Mississippian in age. 

 

 

image.jpeg

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Fossildude19

Shark cartilage from a post here on the Forum

 

gallery_907_308_4622.jpg

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Fossildude19

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

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galaxy777

That is interesting!

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Peat Burns

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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JarrodB

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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Fossildude19

Maybe @Carl will chime in. :) 

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Al Dente

Tabulate coral, probably Favosites. It looks silicified.

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westcoast

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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BobWill

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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fifbrindacier

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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BobWill
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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jpc

I will also profess to be shark-cartilage-ignorant, but this looks like coral to me.  

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Al Dente
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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doushantuo

This article will show you whence the regular polygonals

mass

 

as usual with JP 's stuff,good illo's/documentation

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doushantuo

Fig 18 in this one does the job as well.GRRRRREAT article on the classic Pyrenean area 

 

radio

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Carl

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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BobWill

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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JohnJ

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).

 

IMG_2499.JPG

IMG_2498.JPG

IMG_2500.JPG

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Fossildude19

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

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