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Showing results for tags 'laurel limestone'.
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I just relocated an unusual fossil that had been lost in some shoebox deposits. It appears to be a slightly crushed blastoid, but otherwise well preserved. It is pink colored and may be replaced with dolomite. I found it several years ago in Sumner County, TN at a place called South Tunnel. The site is a railroad cut exposing the Laurel Limestone and a few feet of Waldron Shale at the top, both middle Silurian in age. The rock had fallen out of the cut, but the extremely hard limestone looks like typical Laurel, a dolomitic limestone with very few fossils other than a few crinoid stem segments and the occasional brachiopod. I have been trying to identify it, but I'm not finding much info on Silurian blastoids. From my searches, there seems to be only one known blastoid species from the upper Laurel at St. Paul, Indiana, which is a Troostocrinus sp. Over several years of fossil hunting the area, I have never found anything even slightly similar in any Silurian deposits. Hoping someone here may have some idea what it is.
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