A Fossilized Thing

[Pseudogygites]

Hi again! I’m totally stumped with this one. The rock is limestone, so its not the Billings formation. There is still some matrix on it, but most of the surface is exposed. It’s spherical and slightly faceted. Fossil pearl?

 

[KimTexan]

The matrix itself looks more like a hard shale to mudstone type material. The object  appears to be phosphatized. Hard to tell what it is, but it looks a bit like a bivalve from the 2nd pic. This type of matrix generally will soften when put in acid, like a 3-5% vinegar. The phosphatic pieces usually hold up in the acid without being affected, provided you don’t leave it overnight or something.

  

Here are examples from the North Sulpur River in Texas. The top 3 are a bit bunged up, but also have surplid worm tubes on them.

They have all been placed in vinegar to remove hard clay. 

These are phosphatized gastropods.

 

I assume the environment is marine. I’m not sure thatbit could be anything else with that type of sedimentary stone.

[ynot]

Can You post picture from directly above the object?