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- W2034114886 abstract "ABSTRACT A large assemblage of vertebrate fossils from the La Boca Formation in Huizachal Canyon, near Ciudad Victoria, Tamaulipas, Mexico, is preserved in a unique setting: debris-flow sediments deposited over a landscape with at least modest topographic relief. Angular feldspar lathes in the rock suggest that deposition was associated with penecontemporaneous volcanism. The ~8,000-specimen collection from Huizachal Canyon includes the tritylodontid Bocatherium mexicanum, the burrowing diapsid Tamaulipasaurus morenoi, three types of mammals, two crocodyliforms, two types of dinosaurs, a pterosaur, and three sphenodontians. The fossils generally occur as small (~5 mm), isolated bones or bone fragments, but 35 articulated or associated specimens have been found. No turtles or fishes have been identified, implying a terrestrial source for this assemblage. Biostratigraphic and preliminary radiometric evidence suggest an early Middle Jurassic age, making this assemblage the only substantial terrestrial Middle Jurassic vertebrate fauna known from North America. ABSTRACTO—Una colección grande de vertebrados fósiles recuperados en la Formatión La Boca, expuesta en el Cañón del Huizachal, en las inmediaciones de Ciudad Victoria, Tamaulipas, México, se encuentra conservada en un ambiente singular, constituido por sedimentos de flujo de escombro depositados sobre una paleotopografia de relieve modesto. Fragmentos angulares de feldespato en la roca, sugieren que el deposito estuvo asociado a vulcanismo penecontemporando. Los ~8,000 especimenes colectados en el Cañón del Huizachal incluyen el tritilodóntido Bocatherium mexicanum, el diápsido cavador Tamaulipasaurus morenoi, tres tipos de mamíferos, dos formas de cocodrilos, un pterosaurio y tres clases de esfenodontes. Los fósiles son generalemente huesos fragmentados o aislados de talla pequeña (~5 mm), sin embargo, se ha encontrado 35 especímenes articulados o asociados. No han sido identificados tortugas o peces, lo que sugiere que la fuente de deposito es terrestre. Las evidencias bioestratigráficas y la radiometría preliminar sugieren una edad jurásica media temprana, con lo que esta fauna de vertebrados continentals constituye la única asociación bien establecida para el Jurásico Medio de America del Norte." @default.
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- W2034114886 date "1995-09-14" @default.
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- W2034114886 title "Depositional environments of a Middle Jurassic terrestrial vertebrate assemblage, Huizachal Canyon, Mexico" @default.
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- W2034114886 doi "https://doi.org/10.1080/02724634.1995.10011249" @default.
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