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Coral? Sponge? Found south-central MO


BillC

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All--

 

I'm newer than new, but I've been here before and received great help. Will you please help again?

 

I found this approximately 4.5" x 4.5" (11.4 cm x 11.4 cm) piece in a creek bed (Spring Creek; altitude ~700 ft [213 meters] above sea level) in south-central Missouri about 26 miles north of the Arkansas border. (Very near Rockbridge, MO.) I THINK it is either a coral or a sponge and hope I haven't already misidentified it!

 

Thank you for helping this total novice.

 

--Bill

DSC_7732.JPG

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Hm, I may be totally wrong, but to me this looks like a piece of tufa. Its a calcium carbonate precipitate formed in spring outflows, in some creeks etc. It can be deposited around organic material (pine needles etc), maybe with the help of bacteria or algae. But it is not a fossil.

There is a nice wikipedia entry:

https://en.wikipedia.org/wiki/Tufa

Franz Bernhard

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