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首页> 外文期刊>Stratigraphy >An Early Ordovician conodont fauna from the Santa Rosita Formation at its type area in the Santa Victoria Range, Cordillera Oriental, Northwestern Argentina
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An Early Ordovician conodont fauna from the Santa Rosita Formation at its type area in the Santa Victoria Range, Cordillera Oriental, Northwestern Argentina

机译：阿根廷西北科迪勒拉山脉地区，圣维多利亚区类型地区的圣罗西塔组早期奥陶纪牙形动物群

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摘要

The Cambrian - Lower Ordovician stratigraphic units from the Cordillera Oriental were originally defined in the Santa Victoria Range, Salta Province, northwestern Argentina, however, the extensive outcrops of this region lack detailed biostratigraphic studies. We describe and analyse the first reported conodont fauna from the Santa Rosita Formation at its type area, which produced significant biostratigraphic information. Over 4,500 well-preserved conodont elements were recovered from outcrops of the Santa Rosita Formation at the southern margin of the Santa Victoria River, near the homonymous locality. Collected specimens exhibit a CAI 3 and correspond to the Paltodus deltifer deltifer Subzone of the P. deltifer Zone (middle Tremadocian, Tr2). A number of species are described for the genera Acanthodus, Acodus, Decor icon us, Drepanodus, Drepanoistodus, Filodontus, Granatodontus, Hammannodus, Iapetonudus, Kallidontus, Paltodus, Paroistodus, Teridontus, Tilcarodus, Utahconus, Variabiloconus, Gen. and sp. indet., the protoconodont Phakelodus and the paraconodont Coelocerodontus. Two new conodont species, Drepanoistodus andinus Voldman, Zeballo and Albanesi and Filodontus carolinae Voldman, Albanesi and Zeballo, are diagnosed herein. The studied assemblages include conodont species of wide intercontinental distribution as well as endemic forms from the Central Andean Basin, which characterize a faunal province with a particular signature from the Shallow Water Realm.
机译：来自东方山脉的寒武纪-下奥陶纪地层单元最初是在阿根廷西北部萨尔塔省的圣维多利亚山脉定义的，但是，该地区广泛的露头缺乏详细的生物地层学研究。我们描述并分析了圣罗西塔组在其类型区域首次报告的牙形动物区系，该区产生了重要的生物地层学信息。在同名地方附近的圣维多利亚河南缘的圣罗西塔组露头中，发现了4,500多个保存完好的牙形石元素。收集的标本具有CAI 3并对应于P. deltifer区的Paltodus deltifer deltifer子区（中间Tremadocian，Tr2）。描述了许多物种，例如棘皮动物，棘足动物，装饰图标，腹足纲动物，腹足纲动物，细齿足纲动物，格拉纳多齿纲，Hammannodus，Iapetonudus，Kallidontus，Paltodus，Paroistodus，Teridontus，Tilcarodus，Utahconus，Genus and Variabiloconus。分别是原牙形棘鱼和副牙形棘齿龙。在本文中诊断出两个新的牙形体物种，Drepanoistodus andinus Voldman，Zeballo和Albanesi和Filodontus carolinae Voldman，Albanisi和Zeballo。研究的组合包括洲际分布广泛的牙形石物种以及安第斯中部盆地的特有形式，该特征是动物区的特征，并具有浅水区的特殊特征。

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