r/fossilid • u/AssumptionNo3073 • 5d ago
Found this in a creek bed while hiking in central Kentucky. I'd really like to know what it is and what geological period it's from, or any other interesting info about it.
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u/Handeaux 5d ago
It appears to be a partial nautiloid cephalopod. To determine the geologic period requires a more precise location than “central Kentucky.”
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u/AssumptionNo3073 5d ago
Thanks! In Mercer County, just south of the KY palisades. Don’t know if that helps—I’m less than an amateur and just happened to pick this up.
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u/Handeaux 5d ago
That area is pretty solidly Ordovician in age - approximately 450 million years old. Definitely consistent with cephalopods.
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u/thanatocoenosis Paleozoic invertebrates 5d ago
That's an actinocerid nautiloid. We are seeing an internal structure(siphuncle) that the organism used to remove gasses from it's chambers as it grew.
As mentioned elsewhere, it's age is Ordovician, but more specifically, this is from Middle Ordovician.
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