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Showing results for tags 'allegheny'.
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Hello! Newbie here with a love for fossils. I have a very small collection and only casually hunt for them. Anyways, I was on a trip to Forest County, Pennsylvania this past weekend. I was cruising a creek channel looking for trout in the Allegheny NF when this caught my eye. My gut feeling was this looks like a piece of wood, but it's very dense, it does feel heavy like a piece of stone. There's a lot of sandstone in this creek valley, but this feels much heavier than that. Bark-like striations and some is flaking off like a sedimentary or mica flavor of rock. It's flat on one side with a small ridge down the middle. Both ends are also flat, almost like a cut piece of wood.
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Request for feedback on fossil field guide visual layout
pefty posted a topic in Questions & Answers
I'm working up a series of fossil field guides for various formations. I'd like to provide a visual indicator of which fossils are rare, which are common, and which are abundant, without getting in the way of the visual layout of the fossils & identifying information. The complete set of categories I am working with is {Abundant, Common, Rare, Very Rare, Common to Abundant, Rare to Abundant, Rare to Common, Present, and Questionable}. Has anyone seen a good way that a field guide of any kind has provided such a visual indicator as a page-wide element of visual layout? Attached is my first draft for the brachiopods of the Zaleski Flint Member of the Allegheny Formation (Pennsylvanian) of Ohio. All feedback welcome! Thanks.
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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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