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Shane95b
Hello. I found a fossil the other day in the woods of Tennessee. It is round and closely resembles the body of a turtle. No turtle back patterns just concretion veins. I know tennesee was once connected to africa and underwater at once, which is how we get all our limestone. It does resemble a septerian nodule. But i was thinking it was also possible that long ago when the sediments were behind carried to valleys in the ocean a sea turtle couldve got caught in it and got casted in the limestone. The thing that convinces me that its a turtle is the perfect symmetry and a crack the goes all the way around the rock. It also has one side that has a build up of a thick crusty rock formation, which resmebles the outside casing a geode. Please help thankyou. Click image for larger version - Name: 20180823_165016.jpg, Views: 33, Size: 5.14 MB Click image for larger version - Name: 20180823_165020.jpg, Views: 33, Size: 4.64 MB Click image for larger version - Name: 20180823_165025.jpg, Views: 33, Size: 4.74 MB Click image for larger version - Name: 20180823_165052.jpg, Views: 30, Size: 5.54 MB Click image for larger version - Name: 20180823_165036.jpg, Views: 31, Size: 4.80 MB
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Brittle Star
Hi

It is a nodule and may or may not have formed around a fossil. The only way to find out is use a hammer with or without a chisel. I would say it is not a turtle.

Up to you to be brave and give it a smack.
JW

 Never ask a star fish for directions
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Shane95b
Ok. It is a mystery that must be cracked. Would it be best to split it along the crack the runs all the way through. Or whats the best approach to breaking it.
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Brittle Star
I think i would use the crack. It may split cleanly across.
JW

 Never ask a star fish for directions
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Shane95b
Brittle Star wrote:
I think i would use the crack. It may split cleanly across.
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Shane95b
I put i chisel in it and knocked it a few times and it split easily. There is veins that run through it in the shape of a peace sign which is unique. It has white quarts and some shiny black mineral that make up the veins. Also a brown crust. I didnt bust open the portion that had the crust om the side. I wonder if theres crystals in it. Click image for larger version - Name: 20180827_235245.jpg, Views: 46, Size: 3.45 MB Click image for larger version - Name: 20180827_235236.jpg, Views: 52, Size: 5.18 MB
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estwing
I would say it's a septarian nodule, and probably the white veins are calcite. Mind, it does look like a turtle...
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prep01
Totally agree with Estwing - Septarian nodule with calcite.
Colin Huller
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Shane95b
The almost perfectly symmetrical circle that looks like a peace sign is very unusual. Ill have to take it to UT to get it examined. Does anyone know what the black veins are?
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prep01
Hi again Shane, it's very difficult to say much from a photo, so I'm assuming 'UT' is your best bet, but I am assuming it's a museum or university?
Colin Huller
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Shane95b
Its the university of TN
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estwing
Black material is usually due to organic matter or mineral encrustation (managanese, etc.).
I think the latter would fit better with the septarian nodule.
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Shane95b
Ok thank yall for the help. Ill probably get it polished and looking neat
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Shane95b
Anyone know how the circle vein couldve naturally formed? Is there a ammonite in it?
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