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It looks like limestone to me. The rounding is from chemical weathering and the layering is from the original deposition. Of course, I would need a hand lens for a closer look and hydrochloric acid to see if it fizzes. I'm a geologist so...But I still may be wrong.
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Charlie
1966 912 Polo Red
1950 VW Bug
1983 VW Westfalia; 1989 VW Syncro Tristar Doka
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