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From the album: Fin Lover's South Carolina Finds
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I found two fossilized jaw segments yesterday that I need help IDing, please. I believe the first is either barracuda or wahoo, but I've done a little research and am still not sure how to tell them apart. My guess is wahoo, based on the tooth thickness increasing as it gets closer to the root, but some descriptions I've seen of wahoo teeth describe them as "needle-like", which these are not. Jaw section is 50mm long. Tooth goes from about 1 mm thick at the point to about 5mm at the base. Found in an area that is heavily Oligocene but with a small amount of Miocene (coming from an overlying Pleistocene lag deposit). Jaw #2 I believe is cetacean... something like an echoventator. I previously found a similar one in the same creek, but the spacing between those teeth were greater (both have the double-root teeth). This creek is also Oligocene with some Miocene from overlying lag deposits. 62mm long and 32mm tall. Wet to show the double-root tooth sockets better: New jaw on left, other from same location on right: I hate to @ people if I don't have to but, from reading old posts, I think @Al Dente and @MarcoSr can probably ID wahoo vs. barracuda. Thanks so much!
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Many creeks in Summerville, SC have multiple formations present, so finding a fossil ex-situ often makes identifying the specific formation difficult, especially for those fossils that spanned multiple epochs. Since Acanthocybium solandri were present in the area beginning in the Oligocene, the following formations are possible: Oligocene: Chandler Bridge Formation and Ashley Formation Pliocene: Goose Creek Limestone (early-mid Pliocene), which contains un-reworked Miocene-Pliocene fossils Pleistocene: Ten Mile Hill Formation, which is a mid-Pleistocene lag deposit that can be found overlying older formations in the area. While many Pleistocene fossils in the area are from land mammals, Miocene-Pliocene fossils have been found in the base of the Ten Mile Hill Formation. ID references: 1. Collette, B.B., & Russo, J.L. (1984). Morphology, systematics, and biology of the Spanish mackerels (Scomberomorus, Scombridae). Fishery Bulletin, 82, 545-692. 2. Godfrey, Stephen J. (2018). The Geology and Vertebrate Paleontology of Calvert Cliffs, Maryland, USA. Smithsonian Contributions to Paleobiology. Book. https://doi.org/10.5479/si.1943-6688.100 3. Ray, Clayton E. and Bohaska, David J. 2001. Geology and Paleontology of the Lee Creek Mine, North Carolina, III. Washington, D.C.: Smithsonian Institution. https://doi.org/10.5479/si.00810266.90.1 Stratigraphy information references: 1. Boessenecker, R. (2008, May 13). The Ashley Phosphate Beds: the Reconstruction Era, Vertebrate Paleontology, Fossil Preservation, and Stratigraphic Confusion in Charleston, South Carolina. The Coastal Paleontologist. https://coastalpaleo.blogspot.com/2018/05/the-ashley-phosphate-beds.html. 2. Sanders, A. E., Weems, R. E., & Albright III, L. B. (2009). Formalization of the Middle Pleistocene ‘Ten Mile Hill Beds’ in South Carolina with evidence for placement of the Irvingtonian-Rancholabrean boundary. Papers on Geology, Vertebrate Paleontology, and Biostratigraphy in Honor of Michael O. Woodburne, 363-370.
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I often hear collectors identify a certain type of fish tooth as "either wahoo or barracuda", but I have never seen any photos, articles, books, etc. that show how to tell the difference between the two types of teeth. I know that there are positional variations, but beyond that, are many of the teeth very similar for both species, making them easy to misidentify? Or is there a way to easily distinguish between them? I am referring to specimens collected in the Oligocene beds of S.C. if that helps any. Photos or illustrations would be helpful.
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Another nice surprise from sixgill pete's Lee Creek matrix showed up on my plate last night. I was baffled until I searched on Elasmo.com, and found what I believe is the correct ID for this neat tooth. It looks just like the Wahoo tooth pictured there. I have never seen one before, so I'd like to have my tentative ID confirmed. The photo montage includes all four sides, and top and bottom. Thanks