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I actually found it in my backyard! I live in the Nashville basin area about 25 miles NE of Nashville, about 5 miles from the Cumberland river. Please excuse my lack of knowledge (total amatuer). I am guessing Ordovician. The fossils I am finding in the same area all seem to be common to this area and the ordovician period. I am trying to learn identification as I uncover the rock that contains all these fossils, so again forgive my ignorance. I have more pic. if you are interested, it may take a few days before I can post them.