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Marine vertebrates from the Hartland Shale Upper Cretaceous Upper Cenomanian in southeastern Colorado, USA

, : Marine vertebrates from the Hartland Shale Upper Cretaceous Upper Cenomanian in southeastern Colorado, USA. Cretaceous Research 37(none): 0

The Hartland Shale Member of the Greenhorn Limestone was deposited in the middle of the Late Cretaceous Western Interior Seaway of North America. Rock samples rich in micro-vertebrate fossils were collected from the lower part of the Hartland Shale (ca. 94.6 Ma: early Late Cenomanian) in southeastern Colorado, USA. Through acid treatment of the rock samples, 25 marine vertebrate taxa are identified including chondrichthyans, osteichthyans, and a reptile. Chondrichthyans are represented by seven species: Ptychodus anonymus, Squalicorax curvatus, Carcharias saskatchewanensis, Archaeolamna kopingensis, Cretoxyrhina mantelli, Cretomanta canadensis, and Rhinobatos incertus. Osteichthyan fishes consist of 17 taxa: Micropycnodon kansasensis, cf. Palaeobalistum sp., Caturidae indet., Protosphyraena sp., Plethodidae indet., Elopopsis sp., Pachyrhizodus minimus, cf. Pachyrhizodus sp., Albulidae indet., Cimolichthys nepaholica, Enchodus cf. E. gladiolus, E. cf. E. shumardi, Apateodus sp., and four unidentified teleosts. The only reptilian recognized is the small aquatic lizard Coniasaurus crassidens (Dolichosauridae). The taxonomic composition of the Hartland Shale fauna is similar overall to the extensively sampled, underlying mid-Cenomanian Lincoln Limestone fauna in Colorado and Kansas, although the occurrence of Apateodus and Cimolichthys from the Hartland Shale is notable as they represent geologically the oldest record for the two genera. The vertebrates identified are mostly carnivores that include piscivorous and durophagous forms, providing new insights into the trophic structure of the palaeocommunity.


DOI: 10.1016/j.cretres.2012.03.007

Other references

Van Campenhout, J.; Rasio, E., 1979: Carbohydrate tolerance in gonadal dysgenesis. Among 42 patients with GD, one had clinical diabetes and 10 had chemical diabetes (26%) when tested by OGTT. The insulinogenic index was lower in patients with chemical diabetes than in patients with normal OGTT. Among 19 patients with isolated hy...

Schrier R.W., 1988: Pathogenesis of sodium and water retention in high output and low output cardiac failure nephrotic syndrome cirrhosis and pregnancy first of two parts. New England Journal of Medicine 319(16): 1065-1072

Chiancone, F.M., 1978: Variations in opposite directions of tryptophan pyrrolase and 3 hydroxy anthranilate oxidase after a loading dose of tryptophan. A loading dose of tryptophan induces a marked increase of tryptophan-pyrrolase (substrate induction) and a decrease of 3-hydroxyanthranilate oxidase values in rat liver; in the kidneys the 3-hydroxyanthranilate oxidase is unchanged. In other exper...

Tsitlanadze V.G.; Kartvelishvili E.Yu; Shakulashvili N.A.; Shalamberidze L.P., 1987: The prevalence and some risk factors of gout in the georgian ssr ussr. Terapevticheskii Arkhiv 59(4): 18-20

Pavlov, M.Y.; Freistroffer, D.V.; Ehrenberg, M., 1997: Synthesis of region-labelled proteins for NMR studies by in vitro translation of column-coupled mRNAs. A method to synthesize region-labelled proteins for structural studies with NMR is suggested. The technique is based on in vitro translation of matrix-coupled mRNAs. Translation starts with unlabelled amino acids from the initiation codon of the m...

Keixenbarger, S.; Swenson, S.P.; Schafer, E.G.; Murray, H.C., 1946: Fourth Annual Report of Pea Improvement Work. The increase of pure lines of Alaska and First and Best continued. A yield trial of 45 varieties and strains, including 16 pure Unes of Alaska and First and Best, was conducted at Pullman. Twenty-two of these varieties were also tested at another...

Ijiri, D.; Kanai, Y.; Hirabayashi, M., 2009: Possible roles of myostatin and PGC-1alpha in the increase of skeletal muscle and transformation of fiber type in cold-exposed chicks: expression of myostatin and PGC-1alpha in chicks exposed to cold. This study examined the hypothesis that myostatin and PGC-1alpha are involved in the increase in skeletal muscle mass and transformation of fiber type in cold-exposed chicks. One-week-old chicks were exposed to acute (24h) or long-term (8d) cold a...

Huang, Y.L.; Song, W.O.; Schemmel, R.A.; Hoerr, S.M., 1994: What do college students eat? Food selection and meal pattern. Data are limited on food selections of young adults. This study was undertaken to examine the eating practices of college students relevant to improving nutrition and health education programs. Dietary records (n=1912) were used to determine the f...

Vlay S.C., 1987: Does sex affect myocardial salvage in patients with acute myocardial infarction treated with iv metoprolol. Clinical Research: 309a

Gerashchenko, B.I.anovich; Kosaka, T.; Hosoya, H., 2002: Probing the cell wall surfaces of vegetating algae species by fluorescent concanavalin A. Cytometry Supplement (11): 97