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Thunnus sp. - Tuna Vertebrae from Kazakhstan
Brett Breakin' Rocks posted a topic in Fossil Preparation
Hi There, I've nibbled at the edges of fossil prep for several years but I'm finally getting settled and have some spare time. Most of my finds originally were from Georgia and South Carolina and rarely needed any preparation beyond gentle cleaning. My mailbox finds from Kazakhstan however are caked in Kansas-esque soft silt/clay/chalky matrix, so I attempted to clean one of my larger parcels from the Eocene using a pin vice and eventually a Dremel tool and various brushes. The bone is very hard and well mineralized and is only brittle in some small isolated spots. The matrix gets much harder the deeper you get, but still peels away like soft dirt under the spinning Dremel wheel. I wish I had an air abrasive unit to remove more of the chalky matrix, but I'm getting close to the end using the tools I have. I'll probably build a stand for it to get it up off of the ground. I suspect it is in the Tuna family since we see very similar morphology with Thunnus sp. fish verts from South Carolina. Other fossils found in this area of Kazakhstan are swordfish rostrums, O. auriculatus or something along those lines, and Mackerel fish fossils. Cheers, Brett For Reference: Thunnus sp. South Carolina - Chandler Bridge fm.- 4 replies
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