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Help IDing this Rock Fossil


Jag528

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I've been hanging on to this fossil for years, I recently pulled it out of the bucket it was in and was curious to know if anyone on here could tell me more about it. It's approximately 3 inches in diameter. It was found in a creek bed in south central Missouri. Any advice would be appreciated!

IMG_3172.JPG

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Welcome to the Forum. :)

Can we get a top, bottom and opposite side view of the item?

Regards,

 

 

Picture, cropped and brightened.

 

 

IMG_1113172.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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Thanks for the extra pictures. ;) 

 

IMG_3190.JPG.9405b894ebd449f82998554f97fb973d.JPG

 

Hmm. :headscratch:

 

I'm getting a geologic vibe on this one. 

The rock looks like Chert. Not sure about the processes at play here, but I would have to say eroded chert/limestone nodule. 

Let's wait and see what some others have to say. 

Regards, 

    Tim    VETERAN SHALE SPLITTER

   MOTM.png.61350469b02f439fd4d5d77c2c69da85.png      PaleoPartner.png.30c01982e09b0cc0b7d9d6a7a21f56c6.png.a600039856933851eeea617ca3f2d15f.png     Postmaster1.jpg.900efa599049929531fa81981f028e24.jpg    VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png  VFOTM APRIL - 2015  

__________________________________________________
"In every walk with nature one receives far more than he seeks."
John Muir ~ ~ ~ ~   ><))))( *>  About Me      

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I don't know the geological age, but looks like a basal fragment of a crinoid anchoring system, with the attachment area to the missing column in the upper part, as shown in the first picture.

" We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. "

Thomas Mann

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Interesting, I'll have to do some research to understand more about it. I definitely have a lot to learn about geology. I do know there is quite a bit of chert in that area if that helps. I'm sure you're familiar with Missouri cannonballs which are very common here. 

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Crinoid anchor point is a possibility.  Another thought is a stromatoporoid.

 

Brent Ashcraft

ashcraft, brent allen

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I don't exclude that, but, there are consecutive layers in the 'hole', with radiating regular pattern like the crenulae in crinoid columnals in transverse view. Could be hardly eroded. I thought, in your specimen the lumen in partially eroded out, making visible the interior part of the columnals. Try to make a consensus with these images:

 

F13.large.jpgeroded-crinoid.jpgcolumnal-description.jpg

 

Could be stromatoporoid encrusting crinoid, but the pillars of the structure necessitating this are not quite visible, also, I think, that in the ecrustation process the stromatoporoid might finally cover completely the encrusted 'base', whatever could be that.

 

 

" We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. "

Thomas Mann

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Thank you everyone for your help! I do have one more you might be able to help with, this one was from a river bank in the same area. Looks like a carbon print of something. 

IMG_3193.JPG

IMG_3194.JPG

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Those are weathered crinoid pluricolumnals (partial columns) in longitudinal and oblique section, embedded in the matrix, similar to this one:

 

Crinoid_stem_replaced_with_marcasite.JPG

" We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. "

Thomas Mann

My Library

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