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Hey! I was looking for native artifacts in a neighbourhood creek when I came across what I thought was a somewhat large cephalopod fossil. The creek is in Louisville Kentucky, leading to Floyd’s Fork. From the USGS Mapview, it looks like it’s Ordovician of the Drake’s formation. Either Bardstown member or Saluda Dolomite member. Upon further examination, I saw that the ridges on the sides were angled very steeply. It was very covered by matrix, so I decided to get to work on it with a dremel tool. After getting a significant amount of material off the fossil, I found that the ridges along the side were not in fact bilaterally symmetrical, and rather that these ridges went down the length of it, spiraling like they would on a screw. It is hollow, partially filled in with some softer, red stone and crystallized on the inside. From what I can tell, it has a curve to it reminding me of cyrtoconic(?) cephalopods. I read somewhere that cephalopods are bilaterally symmetrical, so I decided to post this here since I now don’t have any better guesses on what it is. My only other thoughts are that shark coprolites can be spiral shaped, and that it seems too smooth and hollowed to be a horn coral. My heads buzzing about this. Mum said it could be a unicorn horn . Due to upload limits, I will be adding a couple more photos below. I could not find any other fragments of the fossil besides this one section.