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This is a Cretaceous oyster that I found in Post Oak Creek in Sherman, Texas. The oyster has traces of a yellowish calcite-cemented sandstone found in the upper part of the Arcadia Park Formation of the Eagle Ford Group. "Pediformis" in the name, Ostrea alifera var. pediformis, means foot-shaped or pediform because the oyster looks like a foot or boot. In Hill 1898, the author eliminated the Ostrea alifera Cragin, and Ostrea alifera var. pediformis Cragin names because he considered them to be Ostrea lugubris Conrad. I disagree with Hill's decision because my oyster is larger than most O. lugubris (now Cameleolopha lugubris) and lacks an attachment scar characteristic of O. lugubris. My oyster may be a genus Cameleolopha since both Cameleolopha bellaplicata and Cameleolopha lugubris occur nearby. Unless new information can be found, my oyster should be called: Ostrea alifera variety pediformis Craigin. For more information and drawings of Ostrea alifera and Ostrea alifera variety pediformis Craigin see: Cragin, F. W. 1893. "A Contribution to the Invertebrate Paleontology of the Texas Cretaceous", Austin, Texas, B.C. Jones & Co., State printers. Hill, Robert T. & T. W. Vaughan. 1898. The Lower Cretaceous *Grypheas* of the Texas region. U. S. Geological Survey, Bulletin 151: 139 pp.
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From the album: Squamates
This small tooth is likely from a juvenile small, early mosasaur. In just a few million years, these aquatic reptiles would diversify and grow to large sizes.-
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From the album: Prionocyclus bosquensis
Found in the Cretaceous Arcadia Park Formation from the TXI Quarry in Midlothian, Texas. It is Prionocyclus bosquensis according to Jim Kennedy, Professor Emeritus of Natural History at Oxford. He also first described the species. See his paper describing this and other species: Kennedy, W. J. 1988. Late Cenomanian and Turonian ammonite faunas from northeast and central Texas. Palaeontological Association, Special Papers in Paleontology, 39: 131 pp.-
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Here are interior and exterior views of both valves of the Cretaceous oyster, Cameleolopha bellaplicata, collected in Post Oak Creek in Sherman, Texas, The specimen is more oval and elongated that most of the members of its species. The calcite valves with a trace of interior aragonite, mother of pearl, are covered in yellowish calcite cemented sandstone. The larger valve has the remnants of an attached ramose bryozoan that grew on the shell since the muddy Arcadia Park Formation did not provide a great hard ground to grow on. An unidentified domed colonial stone coral species also grow on the oysters in the area. The oysters are found in the upper part of the Arcadia Park Formation that contains a yellowish calcareous sandstone that is rich in small bivalves, shark teeth and other vertebrates. Similar mostly thin-bedded, yellowish and calcareous sandstones occur throughout north Texas and may be related to the thicker Bells Sandstone in eastern Grayson County. See this best reference: Hook, S. C. & Cobban, W. A. 2011. The Late Cretaceous oyster Cameleolopha bellaplicata (Shumard1860), guide fossil to middle Turonian strata in New Mexico. New Mexico Geology. 33: 67-95. Hook points out that Cameleolopha bellaplicata was "initially Ostrea, then Lopha, Alectryonia, and Nicaisolopha, and, now, Cameleolopha." Hook describes the oyster as follows: "Cameleolopha bellaplicata (Shumard 1860) is a medium-sized, plano-convex oyster with 8–27 generally simple plicae (ribs) that radiate from the beak. Secondary ornamentation consists of concentric lamellae that intersect the ribs. The general absence of attachment scars on preserved left valves indicates the species lived unattached as adults on the sea floor. Its left valve is larger and more convex than that of C. lugubris, giving it a more robust appearance and making it better suited to higher-energy, nearshore environments. The type specimens of C. bellaplicata came from the upper Eagle Ford Shale of Grayson County, Texas..." For additional information on the oyster see: Shumard, B. F., 1860. Descriptions of new Cretaceous fossils from Texas: Transactions of the Academy of Science of St. Louis, v. 1, pp. 590–610. Vyalov, O. S., 1936. Sur la classification des huîtres: URSS Academy of Sciences, Comptes rendus (Doklady), new series, v. 4 (13), no. 1 (105), pp. 17–20 (after August 1).
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I found this fish yesterday in the Arcadia Park member of the Eagle Ford Group from the Upper Cretaceous of Dallas County Texas. I have not seen one of these before. I am hoping someone else has. The preservation on this one is very cool. I like the way it is laid out on the slab sort of like all those fish from Wyoming. Does anyone know what genus/species this fish might belong to? Your help is greatly appreciated!