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Shark Cookie cutter Isistius sp Aurora NC Miocene
JamieLynn posted a gallery image in Member Collections
From the album: Aurora North Carolina Micro Matrix Fossils
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I have decided to create some collection threads for various shark teeth. I would like to use these to promote some of the less frequently seen shark teeth. We see plenty of Megatooth, GW's etc but some pretty awesome sharks do not get much love here. I wanted to set this up by taxonomic orders and see what my fellow shark nuts want to share. I think this is a great way to not only share our collections but also build a database that may help help collectors ID teeth or get some idea of what exists to be collected. I love Squaliformes sharks. They are among the the most biologically interesting sharks to have existed. Among the truly fascinating adaptations they have are bioluminescence, biological antifreeze for extreme cold temperature survival, protruding jaws in one species and even pockets ! They represent the smallest sharks but some such as the Pacific Sleeper and Greenland Shark can grow very large. The Greenland Sharks are the oldest known vertebrates on the planet with life spans of possibly longer than 500 years and are the slowest swimming fish. The Largetooth Cookiecutter shark has the largest teeth per body size of any living shark. They are also weird looking sharks that can capture the eye. Google search Rough shark or Pocket Shark or the Viper Dogfish. They are bizarre looking creatures yet perfectly adapted to some of the harshest environments on our planet. For shark tooth collectors they present numerous challenges. Many are deep water sharks with few known fossil locations. Some types of Squaliformes may only be known from one or two fossil sites. Many are small sharks with very small teeth which add to the difficulty in finding them. Rarity creates demand and my experience has shown me that not only are they hard to find, collectors hold on to their Squaliformes teeth. I am not even sure how far back they go in the fossil record as Fossilworks notes Triassic Squaliformes from France but I found no available information beyond a notation. I apologize for the long introduction and biological information that most of you probably know. I am bored educator with no one to educate about sharks lol I would encourage my fellow TFF members to share not only your teeth but your knowledge and fun facts swimming around your brain about the amazing and weird Squaliformes.
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I started spending a bit of time searching matrix this month. It's been a while, and I have found it to be as relaxing and rewarding as I remembered. I made a few pictures just for fun and I included a shark tooth for ID if possible. There have been a few of these odd ball shark teeth in the wonderful Cookie Cutter matrix. If anyone could tell me the position and or possible species of this tiny shark tooth, I would appreciate it.
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This tooth is a lower from the final tooth position (most posterior) on the left side as indicated by the bulge on one side of the tooth and lack of overlapping facet. The lingual face of the tooth is shown in the photo as indicated by the distinct delineation of the crown enamel and the root (less distinct on the labial surface). Teeth in a more anterior position have overlapping facets on both edges (with the symphyseal having both facets on the lingual face). The stratigraphic information for this locality is questionable and so is specified vaguely. The environment is marine shell hash that may span late Miocene-Pleistocene. Dr. Richard C. Hulbert, Jr. from FLMNH had this to say about the locality: There are two “formations” found near the surface in that area of the state. One is the middle to late Miocene Peace River Formation. The other “formation” possible is has been informally called the Okeechobee Formation by Tom Scott, and consists of the sandy shell beds formerly called the Caloosahatchee, Bermont, and Fort Thompson formations. On the geologic map of Florida published by the state’s geological survey it is not designated a formal name and is instead listed as Pliocene/Pleistocene shelly unit. Even if found in situ within the Plio/Pleistocene unit, such specimens could be reworked out of the Peace River Formation. If you are finding them in modern creek alluvium, it will be difficult to be sure which is their original depositional unit.
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The stratigraphic information for this locality is questionable and so is specified vaguely. The environment is marine shell hash that may span late Miocene-Pleistocene. Dr. Richard C. Hulbert, Jr. from FLMNH had this to say about the locality: There are two “formations” found near the surface in that area of the state. One is the middle to late Miocene Peace River Formation. The other “formation” possible is has been informally called the Okeechobee Formation by Tom Scott, and consists of the sandy shell beds formerly called the Caloosahatchee, Bermont, and Fort Thompson formations. On the geologic map of Florida published by the state’s geological survey it is not designated a formal name and is instead listed as Pliocene/Pleistocene shelly unit. Even if found in situ within the Plio/Pleistocene unit, such specimens could be reworked out of the Peace River Formation. If you are finding them in modern creek alluvium, it will be difficult to be sure which is their original depositional unit.
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