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Is it petrified wood? Concretion?


Chronos

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Dear friends, let me submit a sample from the alluvial sands of Kyiv, Ukraine.

Please help me decide: is it a concretion or a fossil, and if it is a fossil, what could it be? May be, it is carbonized wood?
As I know, Cenozoic deposits are possible here in Kyiv. In the Paleogene, the territory of Kyiv was covered by the sea (here the bones of the Basilosaurus were found), since the Neogene - land.

I applied vinegar, and my sample does not respond ;)

Thank you in advance for the tips!

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I agree with that.

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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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In addition: it looks like a light unstructured cylindrical rod surrounded by a concentrically dark “tube”, which, in turn, is surrounded by a light concentric surface “tube” - “bark”.
I am thinking about the version of the burrow. If it is true, then who can be the owner?
The diameter of the light core is about 12 mm.
Lizard? A tiny rodent? Insect?

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