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Hello together, I just remembered an interesting specimen I have had for many years, my uncle gave it to me when I was a kid. Unfortunately I have no information on its origin. It has some structures that may be diagnostic to the right eye though. Some pictures of rudists I recently saw reminded me of its general appearance, but now looking at it again I wonder if it is a big gastropod columella. the reddish middle part marked in black is actually standing out much more than the flashlight-picture shows, with cavities left and right that may have connected behind before being covered in calcite. the lower left corner shows some structure, zoomed in on the second pic. there are also some bullet-shaped holes that look like negatives of belemnite rostra or maybe clam borings? (secon pic lower right) Hoping for your insight, Best Regards, J
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Hoping someone easily recognizes these and its an easy answer...my initial searches have been fruitless... So I was supposed to be looking for more Florida coprolites in the garage piles of fossils and got sidetracked looking as this large Turbinella columella and just noticed these tan circular markings on it and wanted to know if they were traces of serpulids? Probably Pliocene Tamiami formation, Sarasota County, Florida. Whats fascinating to me is their spiral?/concentric, ornamented/segmented? shape which appears to actually be etched into the gastropod shell itself. Almost look like cross sections of forams. I've scraped a number of the small white serpulid tubes off thinking I'd see a similar pattern but there is no marking beneath them--its perfectly smooth. If it is a tube, I wasnt aware that they could actually score the surface of the gastropod shell--seems pretty neat if thats what going on but maybe its something entirely different. The gastropod, aside from being badly damaged has sponge borings, barnacle and coral encrustration, and serpulid tubes. Most of the circular traces are around 1mm in diameter and a few push the 2 or 3mm size. Thanks for the help! Regards, Chris