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Showing results for tags 'rr grade'.
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Found this 2 weeks back in Green Bay, Wisconsin but was part of an old railroad grade so most likely not originally from Green Bay but still probably from Wisconsin. Looks like 2 half spheres about the size of a quarter and one is slightly inserted into the other. The ring around the top half is perfectly straight and smooth so I'm pretty sure it's not a egg shell. Was thinking it might be some type of sea urchin. The bottom "cap" is damage from rock crushing.