I'm not sure yet what the large circular object in the middle is, but inside of it is a piece of a fenestrate bryozoan (the dark circle with the darker ovoid patches that look like giant alien eyes). The larger object has a cross-lamellar microstructure, which suggests that it's a brachiopod spine, but I've never seen one anywhere near this large. Also, it has suffered significant erosion before finally being deposited in this carbonate sand (otherwise known as skeletal grainstone). The rock is Mississippian and the image is 1 mm wide.
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