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Taxonomy from Lowney 1980. Diagnosis from Lowney 1980, p. 949: "The skull roof is usually ornamented faintly at the lateral borders of the dermopterotics and frontals; the center of the skull roof appears smooth. The maxilla narrows under the orbit and tapers sharply at the anterior end (Text-fig. 3; PI. 2, fig. 4). The nasals are Y-shaped, with a long posterior process. The suboperculum is equal to or larger than the operculum. The lateral line scales remain tall and serrate all the way to the caudal (P1. 1, fig. 5). There are often a few vertebral centra visible anteriorly (Text-fig. 3B). The position of fins is as follows: dorsal-15, anal13, pelvic-6, caudal-21. The depth of the lateral line scales is three and one half times the width." Identified 2015 by TFF member dshamilla. Line drawing from Lowney 1980, p. 943: Microhaplolepis serrata, scale = 2 mm. References: Newberry, J.S. (1856) Description of several new genera and species of fossil fishes, from the Carboniferous strata of Ohio. Proceedings of the Academy of Natural Sciences of Philadelphia 8: 96–100. Westoll, T. S. (1944) The Haplolepidae, a new family of late Carboniferous bony fishes : a study in taxonomy and evolution. Bulletin of the AMNH ; v. 83, article 1. Lowney, K. (1980) A Revision of the Family Haplolepidae (Actinopterygii, Paleonisciformes) from Linton, Ohio ( Westphalian D, Pennsylvanian). Journal of Paleontology, Vol. 54, No. 5, pp. 942-953. Hook, Robert W and Ferm, J. C. (1985) A depositional model for the Linton tetrapod assemblage (Westphalian D, Upper Carboniferous) and its paleoenvironmental significance. Phil. Trans. R. Soc. Lond. B 311, 101-109. Hook Robert W. and Baird, Donald (1986) The Diamond Coal Mine of Linton, Ohio, and its Pennsylvanian-age vertebrates. Journal of Vertebrate Paleontology, Vol. 6, 1986, pp. 174-190. Hook, Robert W. and Baird, Donald (1988): An Overview of the Upper Carboniferous Fossil Deposit at Linton, Ohio. The Ohio Journal of Science. v88, n1, 55-60. dshamilla, May 19, 2015: Identifying Paleoniscoid Fishes From Linton Ohio, Upper Pennsylvanian - General Fossil Discussion - The Fossil Forum
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This head spine has just reappeared in my collection - I must have found it about 20 years ago in Linton. Is that an Orthacanthus or Xenacanthus head spine? The length is about 8 cm / 3". Thanks Thomas
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Today turned out to be a good day to go through Linton Cannel Coal. I haven't searched the fossil coal in a while. Just for fun, I was looking through some blocks when I spotted a shark spine buried in a thin layer of spore cannel. Usually when I split the coal, I use a knife, but this piece was so thin and fragile I decided to blow of the layer with an air nozzle. When I did this, not only did I see a spine, but nearly a complete Shark was there. Typically the size of the coal block limits the fossil size. Today's fossil Orthacanthus compressus was missing the head and the tip of the tail. Sigh. This shark is from a coal mine in SE Ohio. The coal is Upper Pennsylvanian in age (300 myo). I have included a sketch of what an Orthacanthus may have looked like.
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Line drawing: References: Hook, Robert W. and Baird, Donald (1988): An Overview of the Upper Carboniferous Fossil Deposit at Linton, Ohio. The Ohio Journal of Science. v88, n1 (March, 1988), 55-60. R.W. Hook and J. C. Ferm (1985) A depositional model for the Linton tetrapod assemblage (Westphalian D, Upper Carboniferous) and its paleoenvironmental significance. Phil. Trans. R. Soc. Lond. B 311, 101-109 (1985) Robert W. Hook and Donald Baird (1986) The Diamond Coal Mine of Linton, Ohio, and its Pennsylvanian-age vertebrates. Journal of Vertebrate Paleontology, Vol. 6, 1986, pp. 174-190
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Taxonomy from Lowney, 1980. Diagnosis for the genus Parahaplolepis from Lowney 1980, p. 944: "The body is relatively long and slender, with a ventral lateral line. There are no separate dermopterotics in the skull roof. The anterior pit line of the skull roof extends onto the frontal from the parietal. The posterior margin of the skull roof is deeply embayed for the reception of the extrascapulars and posttemporals, and the latter two pairs of bones meet in the midline. The skull roof ornament consists of broad raised rugae or low tubercles. The maxilla (in the one species where it is known) has a rather tall posterior expansion. There is a small quadratojugal present behind the maxilla." Diagnosis for the species P. tuberculata from Lowney 1980, p. 945: "The frontals are covered with a randomly arranged pattern of broad rugae and smaller coarse tubercles. Their anterior border is usually indented slightly for the reception of the postrostral, and the posterior margin is more or less straight across. The latter characters serve to distinguish P. tuberculata from the other known members of the genus, P. anglica and P. canadensis, in which the posterior margins are obliquely directed anteriorly (Westoll, 1944; Baird, 1978). The fin positions are as follows: dorsal-23, anal-18, pelvic-8, caudal-27. The anterior lateral line scales are serrate on the hinder margin, but these serrations disappear at the level of the dorsal fin. The depth of the lateral line scales is approximately four times the width." Line drawing from Westoll 1944, p. 30: Identified by TFF member dshamilla. References; Hook, Robert W. and Baird, Donald (1988): An Overview of the Upper Carboniferous Fossil Deposit at Linton, Ohio. The Ohio Journal of Science. v88, n1 (March, 1988), 55-60. R.W. Hook and J. C. Ferm (1985) A depositional model for the Linton tetrapod assemblage (Westphalian D, Upper Carboniferous) and its paleoenvironmental significance. Phil. Trans. R. Soc. Lond. B 311, 101-109 (1985) Hook, Robert W. and Baird, Donald (1986) The Diamond Coal Mine of Linton, Ohio, and its Pennsylvanian-age vertebrates. Journal of Vertebrate Paleontology, Vol. 6, 1986, pp. 174-190. Westoll, T. Stanley (1944) The Haplolepidae, a new family of late Carboniferous bony fishes : a study in taxonomy and evolution. Bulletin of the AMNH ; v. 83, article 1 Lowney, K. (1980) A Revision of the Family Haplolepidae (Actinopterygii, Paleonisciformes) from Linton, Ohio ( Westphalian D, Pennsylvanian). Journal of Paleontology, Vol. 54, No. 5, pp. 942-953. dshamilla: Identifying Linton Paleoniscoid Fish
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Line drawing: References: Hook, Robert W. and Baird, Donald (1988): An Overview of the Upper Carboniferous Fossil Deposit at Linton, Ohio. The Ohio Journal of Science. v88, n1 (March, 1988), 55-60. R.W. Hook and J. C. Ferm (1985) A depositional model for the Linton tetrapod assemblage (Westphalian D, Upper Carboniferous) and its paleoenvironmental significance. Phil. Trans. R. Soc. Lond. B 311, 101-109 (1985). Robert W. Hook and Donald Baird (1986) The Diamond Coal Mine of Linton, Ohio, and its Pennsylvanian-age vertebrates. Journal of Vertebrate Paleontology, Vol. 6, 1986, pp. 174-190.
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Searching in Cannel Coal, I previously thought unproductive, yielded a rare Tremnospodyl Amphibian called Erpetosaurus radiatus. I have never found one of these before and consider myself lucky to have found this one. The very bottom layer of the Linton Cannel coal is very tough and just made of Sporite. Seldom do I ever look in the layer, there is just nothing there to see; or so I thought. Back in September, I knew I had a nice skull, I just didn't know what it was. Well thanks to Fossil Forum member Dave ( you know who you are ) the skull has been identified. My skull is more complete than the drawing. I'm hoping the researcher finds it helpful. The color drawing is the closest amphibian I could find to what an Erpetosaurus looked like. Credits for this drawing go to Russian artist Dmitry Bogdanov. After Googling the name Erpetosaurus, I found there is precious little information on this Amphibian. Enjoy my newest Linton find.
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I've been going through my Pennsylvanian Cannel Coal and have identified a few partial finds. The jaws of a Fish, Amphibian and possible Reptile. Click on the pictures to enlarge for detail. The fish jaw is that of Rhabdoderma elegans with a neat "fingerprint" pattern on the exterior side. The next is an amphibian jaw of Sauropleura pectinata. Last is the jaw of a possible Microsaur. To this day, I'm still amazed at the detail the coal can save of these ancient creatures of over 300 million years ago.