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首页> 外文期刊>Ameghiniana: Revista de la Asociacion Paleontologica Argentina >HIGH RESOLUTION TRILOBITE BIOSTRATIGRAPHY FOR THE EARLY LATE TREMADOCIAN (Tr2) INTERVAL (EARLY ORDOVICIAN) SANTA ROSITA FORMATION, ARGENTINE CORDILLERA ORIENTAL
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HIGH RESOLUTION TRILOBITE BIOSTRATIGRAPHY FOR THE EARLY LATE TREMADOCIAN (Tr2) INTERVAL (EARLY ORDOVICIAN) SANTA ROSITA FORMATION, ARGENTINE CORDILLERA ORIENTAL

机译：高分辨率Trilobite生物带来初期特雷调（TR2）间隔（早期ordovician）Santa Rosita Mablation，阿根廷Cordillera东方

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The early late Tremadocian (Tr2) interval is exceptionally well-represented in eastern areas of the Argentine Cordillera Oriental. New field collections and detailed taxonomic reassessments, as well as a reevaluation of regional data, permit the development of a highly resolved trilobite-based biostratigraphic framework. The concept of the traditional Bienviffia tetragonalis biozone is emended and the new Asaphellus nazarenensis biozone is proposed. Hence, the Tr2 interval encompasses a succession of four trilobite biozones including in ascending order the Kainella teiichii, the Bienvillia tetragonalis, the Asaphellus nazarenensis, and the Notopeltis orthometopa biozones. This resolution is notably higher than that provided by biostratigraphically significant groups such as graptolites and conodonts, and allows a detailed basinwide correlation. New taxonomic information on A. nazarenensis Tortello and Esteban and N. orthometopa (Harrington), is provided and the new species Asaphellus albae sp. nov. is defined. Detailed correlation of the trilobite fauna from the Tr2 interval with that of other paleocontinents is difficult. Taxa are mostly endemic or display wide geographic distributions but with long stratigraphic ranges. Overall, both trilobite-based and indirect international correlations highlight that this interval is hardly recognized, incompletely preserved, or the trilobite fauna is poorly known in most areas of Gondwana. Consequently, due to the completeness of the stratigraphic and fossil records of the Tr2 in the Cordillera Oriental, this region represents a global reference site for the study of this interval.
机译：早期的Temendocian（TR2）间隔在阿根廷Cordillera东方的东部地区表示异常良好。新的田间收集和详细的分类重新评估，以及区域数据的重新评估，允许开发基于高度解决的三洛替洛氏生物数据库框架。建议制定传统的Bienviffia Tetragrainalis Biozone的概念，并提出了新的Asaphellus Nazarenensis Biozone。因此，TR2间隔包括四个三叶虫生物区域，包括升序升序，依伊氏菌，生物维芽孢杆菌，Asaphellus Nazarenensis和Notopellis Orthometopa生物沸石。该分辨率显着高于生物有重要组，例如Graptolites和Conodonts，并且允许详细的进一步的相关性。提供了关于A. Nazarenensis Tortello和Esteban和N. Orthometopa（Harrington）的新分类信息，以及新的asaphellus albae sp。 11月。被定义为。 Trilobite Fauna从TR2间隔的详细相关性与其他古连素的间隔很困难。分类群主要是流行或显示广泛的地理分布，但具有长地层范围。总的来说，基于Trilobite和间接国际相关性的突显地强调了这一间隔难以承认，不完全保存，或者TriLILOBITE FAUNA在GONDWANA的大部分地区都很糟糕。因此，由于Tr2在Cordillera东方Tr2的地层和化石记录的完整性，该区域代表了对该间隔的研究的全局参考现场。

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