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Showing results for tags 'isurus retroflexus'.
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From the album: Fossil Collection: DC Area and Beyond
Isurus retroflexus Aurora Fossil Museum, NC Pungo River and Yorktown Formations Miocene-
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From the album: Calvert Cliffs
© bthemoose
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The Goose Creek Limestone is early-mid Pliocene and contains un-reworked Miocene-Pliocene fossils. ID references: 1. Gale, B. (2020). A Beachcomber's Guide to Fossils. The University of Georgia Press. 2. Kocsis, L. (2007). Central paratethyan shark fauna (Ipolytarnóc, Hungary). GEOLOGICA CARPATHICA-BRATISLAVA-, 58(1), 27 3. Maisch IV, H., Becker, M., & Chamberlain Jr, J. (2015). Chondrichthyans from a lag deposit between the Shark River Formation (Middle Eocene) and Kirkwood Formation (Early Miocene), Monmouth County, New Jersey. Paludicola, 10, 149-183. 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. Campbell, M. R., & Campbell, L. D. (1995). Preliminary biostratigraphy and molluscan fauna of the Goose Creek Limestone of eastern South Carolina. Tulane Studies in Geology and Paleontology, 27(1-4).
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From the album: Fin Lover's South Carolina Finds
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Isurus retroflexus is from the Miocene-Pliocene epochs. While the vast majority of what I find in this particular location is Miocene-Pliocene in age and is likely to have come from the Goose Creek Limestone formation (early-mid Pliocene), we can't rule out the possibility that it came from an overlying lag deposit called the Ten Mile Hill Formation. The Ten Mile Hill Formation is mid-Pleistocene and can be found overlying older formations in the area. Since Miocene-Pliocene fossils have been found in the base of the Ten Mile Hill Formation and this tooth was ex-situ, the formation is undetermined. ID references: 1. Gale, B. (2020). A Beachcomber's Guide to Fossils. The University of Georgia Press. 2. Kocsis, L. (2007). Central paratethyan shark fauna (Ipolytarnóc, Hungary). GEOLOGICA CARPATHICA-BRATISLAVA-, 58(1), 27 3. Maisch IV, H., Becker, M., & Chamberlain Jr, J. (2015). Chondrichthyans from a lag deposit between the Shark River Formation (Middle Eocene) and Kirkwood Formation (Early Miocene), Monmouth County, New Jersey. Paludicola, 10, 149-183. 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. Campbell, M. R., & Campbell, L. D. (1995). Preliminary biostratigraphy and molluscan fauna of the Goose Creek Limestone of eastern South Carolina. Tulane Studies in Geology and Paleontology, 27(1-4). 3. 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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After I remarked that the little tooth below (found on Morris Island, South Carolina) looked interesting on his trip report thread, forum member @Family Fun kindly gifted it to me, asking only that I help identify the species and share the result. My assessment is that this is an Isurus retroflexus posterior tooth, but hopefully others here can either confirm or correct that ID. This tooth has a non-serrated crown that is still fairly sharp and to my eyes at least has the raised labial platform indicative of I. retroflexus. There is a single cusplet on one side. Thanks for your help with this one, and thank you @Family Fun for your generosity! (Unfortunately, the tooth split down the middle on its journey to me, which is the crack you can see in the photos, but I was able to glue it back together.)
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Found between Plum Point and Parker’s Creek. It is an upper anterior. Isurus retroflexus may be conspecific with Isurus paucus. Not found in situ.
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- calvert formation
- chesapeake group
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