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• W2883993312 abstract "espanolUna localidad icnofosilifera en una de las orillas del Rio Numi en las cercanias de la Ciudad de Tlaxiaco, noroeste de Oaxaca, al sur de Mexico, conserva las huellas de dinosaurios sauropodos y teropodos; esta se localiza dentro de la secuencia estratigrafica de la Formacion Zorrillo-Taberna Indiferenciadas, de edad Jurasico Medio (Bajociano). Se identifico un conjunto de pie-mano de afinidad anquilosauriana (Tetrapodosaurus) en un bloque de roca procedente de esta formacion; las huellas se encuentran conservadas como hiporrelieves convexos. El pie es tetradactilo, con las puntas de los dedos curvadas ventralmente, sugiriendo que estas fueron impresas profundamente en el sedimento. La mano es pentadactila, con dedos pequenos y romos. Una estructura curvada, conservada junto a las huellas, es interpretada aqui como un arrastre de cola. El estrato original de procedencia del bloque portador de las huellas, fue identificado y dos huellas adicionales de anquilosaurios fueron encontradas in situ, conservadas como rellenos naturales de arenisca. Un relleno natural de una mano fue encontrado de forma aislada; este presenta los mismos caracteres morfologicos de la mano anquilosauriana; sin embargo, algunas caracteristicas como la concavidad medio lateral de la zona palmar indica la presencia de un cojinete, y podria sugerir la mecanica funcional de la mano anquilosauriana. La Formacion Zorrillo-Taberna Indiferenciadas es una formacion con estratos de carbon; en otras secuencias sedimentarias las huellas de anquilosaurios se concentran en facies aluviales y portadoras de carbon, esto sugiere que al menos los Ankylosauria norteamericanos estaban adaptados a condiciones paleoecologicas similares, desde el Jurasico Medio al Cretacico Temprano. Este trabajo representa el segundo reporte de huellas de anquilosaurios en Mexico, y el mas sureno del icnogenero Tetrapodosaurus en Norte America; sugiriendo un continuum geografico en el registro de Ankylosauria, hasta el sur de Norte America durante el Jurasico Medio. Ademas, son los icnofosiles mas antiguos de anquilosaurios conocidos hasta este momento. EnglishA track-bearing locality in one of the shores of the Numi River, near the City of Tlaxiaco, northwestern Oaxaca, southern Mexico, preserves the footprints of sauropod and theropod dinosaurs; it is located within the stratigraphic sequence of the Zorrillo-Taberna Indiferenciadas Formation, of Middle Jurassic (Bajocian) age. A well-preserved manus-pes set of ankylosaurian affinity (Tetrapodosaurus) is preserved on a rock block from this formation. These tracks are preserved as convex hyporeliefs. The pes impression is tetradactyl, with ventrally curved toe tips, suggesting that these were deeply impressed in the sediment. Manus impression is pentadactyl, with short and blunt digits. A curved structure preserved together with these footprints is herein interpreted to be a tail drag. The stratigraphic unit from whence this block came was identified and two additional ankylosaurian tracks, were found preserved in situ as natural sandstone casts. An isolated handprint, has the same features that fit the ankylosaurian hand morphology; however, some features such as a medio-lateral concavity are indicative of the presence of a well-developed palmar pad, and could suggest the functional mechanics of the ankylosaurian manus. The Zorrillo-Taberna Indiferenciadas Formation is a coal-bearing formation; after the global record, ankylosaur footprints are concentrated in coal-bearing and floodplain facies, thus suggesting, that at least the North American Ankylosauria were adapted to similar paleoecological conditions from Middle Jurassic to Early Cretaceous times. It represents the second report of ankylosaurian tracks from Mexico and the southernmost record of the ichnogenus Tetrapodosaurus in North America. In this way, it suggests a geographic continuum in the record of the Ankylosauria to southern North America during Middle Jurassic times. With their Middle Jurassic age, these footprints represent the oldest ankylosaurian ichnofossils known to date." @default.
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• W2883993312 date "2018-07-10" @default.
• W2883993312 modified "2023-09-30" @default.
• W2883993312 title "Middle Jurassic ankylosaur tracks from Mexico" @default.
• W2883993312 doi "https://doi.org/10.18268/bsgm2018v70n2a8" @default.
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