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• W20506489 abstract "Abstract. The lowermost part of the San Juan Formation (Archaeorthis Zone) contains a more diverse brachiopod fauna than has previously been reported. The age of the sampled interval ranges from the late Tremadoc (P. deltifer Zone) to the early Arenig (P. elegans Zone). The basal patch-reefs have yielded the oldest Ordovician brachiopods of the Precordilleran carbonate platform, represented by an undetermined syntrophiidine. The overlying burrowed wackestones and bioclastic grainstones contain the following taxa: Tritoechia (Parvitritoechia) preandina n. subgen. et sp., Tritoechia (Tritoechia) prima n. sp., Orthidium prominens n. sp., Nothorthis marginata n. sp. (with two subspecies, N. m. marginata and N. m. crassicosta n. subsp.), Syntrophia sanjuanina n. sp. and Parallelostrophia septata n. gen. et sp. The low-diversity pentamerid- dominated assemblages recovered from the channel and intermound facies, as well as the Archaeorthis-dominated communities from the overlying whole-fossil wackestones, flourished in the highenergy, shallow-water environments prevailing at the beginning of the late Tremadoc-early Arenig transgressive event. The increase in brachiopod abundance and diversity upwards in the section appears to be related to the increasing environmental stability resulting from the gradual deepening of the basin.Resumen. NUEVOS BRAQUIOPODOS SILICIFICADOS DEL TREMADOCIANO TARDIO- ARENIGIANO TEMPRANO DE LA PARTE INFERIOR DE LA FORMACION SAN JUAN, PRECORDILLERA ARGENTINA. La parte inferior de la Formacion San Juan (Zona de Archaeorthis) contiene una fauna de braquiopodos mas diversa de lo que se habia previamente reportado. La edad del intervalo muestreado se extiende desde el Tremadociano Tardio (Zona de P. deltifer) al Arenigiano Temprano (zonas de P. proteus y de P. elegans). Los biohermos basales contienen los braquiopodos ordovicicos mas antiguos de la plataforma carbonatica de la Precordillera argentina, representados por un Syntrophiidina indeterminado. Los wackestones bioturbados y los grainstones bioclasticos suprayacentes contienen los siguientes braquiopodos: Tritoechia (Parvitritoechia) preandina n. subgen. et sp., Tritoechia (Tritoechia) prima n. sp., Orthidium prominens n. sp., Nothorthis marginata n. sp. (con dos subespecies, N. m. marginata y N. m. crassicosta n. subsp.), Syntrophia sanjuanina n. sp. Y Parallelostrophia septata n. gen. et sp. Las comunidades de baja diversidad dominadas por pentameridos asociadas a los biohermos y las comunidades dominadas por Archaeorthis presentes en los wackestones suprayacentes, que incluyen la mayor parte de la fauna silicificada aqui descripta, florecieron en ambientes someros de alta energia prevalecientes en los comienzos de la transgresion del Tremadociano Tardio-Arenigiano Temprano. El subsequente incremento en la diversidad y riqueza de los braquiopodos podria estar relacionado con laS condiciones mas estables resultantes de la gradual profundizacion de la cuenca." @default.
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• W20506489 date "2003-01-01" @default.
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• W20506489 title "New late Tremadoc-early Arenig silicified brachiopods from the lower part of the San Juan Formation, Argentine Precordillera" @default.
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