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Animal or mineral?


Rosemary

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I found this inside a soft clayey stone. Washed if off and wondered about the symmetry. Is it fossil? Thx!

ID.jpg

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The symmetry probably washed off with the clay. There's just a hint of a pattern in the enlarged photo, but I'm not seeing anything fossil there.

 

 

Mark.

 

Fossil hunting is easy -- they don't run away when you shoot at them!

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I think there are two different ichno taxa here. One with simple fill, and the other a more complex structure.

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52 minutes ago, ynot said:

I think they look like burrow cast with mineralization in them.

Could be just a difference in preservation all right.

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