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What can this be?


Wronex

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Looks to be a concretion.

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Accomplishing the impossible means only that the boss will add it to your regular duties.

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Half of a concretion. 

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Mark.

 

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

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So I was half way right.... :DOH:

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Accomplishing the impossible means only that the boss will add it to your regular duties.

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Thank you all! 

I'm learning something new every time I visit this forum :)

 

So Im guessing that the shape inside is not remaining of an animal/plant but just a forming matter, which color and composition differ from the initial and final forming matter. 

 

 

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That's correct. The exact process varies, but basically these are formed after sediments are deposited. Ground water and soluble minerals are common elements. Chemistry no doubt plays a role as well. 

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2 hours ago, Wronex said:

Thank you all! 

I'm learning something new every time I visit this forum :)

 

So Im guessing that the shape inside is not remaining of an animal/plant but just a forming matter, which color and composition differ from the initial and final forming matter. 

 

 

Some do form around organic matter. (Google "Mazon Creek fossils" or "Washington state crab fossils") Most don't.

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Mark.

 

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

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