Carboniferous deposits of northern Sierra de Tecka, central-western Patagonia, Argentina: paleontology, biostratigraphy and correlations
Carboniferous deposits of northern Sierra de Tecka, central-western Patagonia, Argentina: paleontology, biostratigraphy and correlations
复制标题
阿根廷巴塔哥尼亚中西部特卡山脉北部的石炭纪沉积物：古生物学、生物地层学和相关性
作者：
A. Taboada;M. A. Pagani;M. K. Pinilla;Franco Tortello;C. A. Taboada
一条狭窄的上古生界带穿过Quebrada de Güera-Peña（阿根廷巴塔哥尼亚）出露在Sierra de Tecka的北方尖端。在那里，Pampa de Tepuel组的黑色页岩中含有以前被列为“Levipustula”动物群的海洋无脊椎动物化石。作者最近记录的材料包括腹足类[Glabrocingulum（Glabrocingulum）operimense（麦克斯韦），G.（Stenozone）argentinum（Reed）、银叶草G.（Stenozone）sp.，特卡秘鲁螺旋体，Ananias riccardii Pinilla]，双壳类[Nuculopsis（Nuculopsis）patagoniensis González，Phestia tepuelensis González，Streblopteria sueroi González，Streblopteria sp.]，conulariids [Paraconularia cf. ugartei Cúneo和Sabattini]、腕足动物[Amosia sueroi Simanauskas、Amoignetus laevicaudatum（Amos）、Beecheria patagonica Amos]、三叶虫[Australosutura argentinensis Hahn和Hahn]、头足动物[Pseudorthoceratidae Flower和Caster、Sueroceras？例如，中角龙？sp.]，和皱纹珊瑚[？Lophophyllidididae摩尔和杰福兹]。此外，本研究还包括新的关键腕足动物dammanorum gen. et sp. nov.和atroculatella waterhousei sp. nov.来自Tepuel-Genoa盆地的年轻地区。本文建议将Pennsylvania晚期的Apriigneotus laevicaudatum和Apriigneotus-Verchojania亚带取代原Aprioculatella带。此外，以前的地层关系和研究部分与阿罗约佩斯卡多（埃斯坦西亚Ap Iwan）和埃斯克尔地区的对比进行了讨论。在埃斯坦西亚Ap Iwan出露的冰川相关剖面的一般地层剖面包括较低的砾岩层，其年龄被重新解释为早侏罗世，以及部分相当于Pampa de Tepuel组但比Quebrada de Güera-Peña组更老的冰川层。埃斯克尔组与阿罗约佩斯卡多组和其他同期单位的古太平洋边缘的相关性进行评估，这意味着埃斯克尔组应分离的Tepuel组。Esquel和Arroyo Pescado地层可被视为Tepuel-Genoa盆地冰海柱的基底。
A narrow upper Paleozoic belt crops out in the northern tip of Sierra de Tecka through the Quebrada de Güera-Peña (Patagonia, Argentina). There, black shales of the Pampa de Tepuel Formation contain marine fossil invertebrates previously listed as belonging to the “Levipustula” fauna. Material recently recorded by the authors comprises, in order of abundance, gastropods [Glabrocingulum (Glabrocingulum) poperimense (Maxwell), G. (Stenozone) argentinum (Reed), G. (Stenozone) sp., Peruvispira teckaensis sp. nov., Ananias riccardii Pinilla], bivalves [Nuculopsis (Nuculopsis) patagoniensis González, Phestia tepuelensis González, Streblochondria sueroi González, Streblopteria sp.], conulariids [Paraconularia cf. ugartei Cúneo and Sabattini], brachiopods [Amosia sueroi Simanauskas, Languigneotus laevicaudatum (Amos), Beecheria patagonica Amos], trilobites [Australosutura argentinensis Hahn and Hahn], cephalopods [Pseudoorthoceratidae Flower and Caster, Sueroceras? sp., Mitorthoceras? sp.], and rugose corals [?Lophophyllidiidae Moore and Jeffords]. In addition, the present study includes the new key brachiopods Languigneotus dammanorum gen. et sp. nov. and Tuberculatella waterhousei sp. nov. from younger localities of the Tepuel-Genoa Basin. The Languigneotus laevicaudatum and Languigneotus-Verchojania subzones (late Pennsylvanian) are proposed herein to replace the former Tuberculatella Zone. In addition, previous stratigraphic relationships and correlations of the study section with the Arroyo Pescado (Estancia Ap Iwan) and Esquel areas are discussed. The general stratigraphic profile of a glacial-related section cropping out at Estancia Ap Iwan includes lower conglomeradic beds, which are reinterpreted as early Jurassic in age, and glacimarine levels that are partially equivalent to the Pampa de Tepuel Formation but older than those of Quebrada de Güera-Peña. A correlation of the Esquel Formation with the Arroyo Pescado Formation and other contemporaneous units on the paleopacific margin is assessed, implying that the Esquel Formation should be segregated from the Tepuel Group. The Esquel and Arroyo Pescado formations can be regarded as the basement of the glaciomarine column of the Tepuel-Genoa Basin.