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BudB

Animal, mineral, or plant?

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BudB

I found these in a creek bed in southern Ellis County, Texas. But there are also lots of them in the North Sulfur River. What are they? They have ridges on one side and are smooth on the other, just like a shell, but they are flat. They vary in size and thickness. The top images show the ridged side on the left and the smooth side on the right. I see plenty of them by themselves, but they are also found in other rocks, right alongside what are obviously fossils, like in the bottom image.

ellis003.jpg

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BudB

Found in the same creek bed, this appears to be a fossil of some kind, but I'm not sure what.

ellis007.jpg

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Fossildude19

Rudists, possibly?

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Heteromorph

The top set of pictures are calcitic inoceramid shell bits, and the bottom is likely a burrow infilling. You are hunting in the Austin Group, probably in the Santonian aged Bruceville Marl Formation by the looks of it. But the exact formation is hard to say for sure.

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