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The Carboniferous-Permian boundary at Carrizo Arroyo, Central New Mexico, USA

机译：美国新墨西哥州中部Carrizo Arroyo的石炭-二叠纪边界

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摘要

At Carrizo Arroyo southwest of Albuquerque, New Mexico, USA, an approximately 105-m-thick section of upper Paleozoic clastic and carbonate rocks yields extensive fossil assemblages of marine and nonmarine origin. Most of the section at Carrizo Arroyo belongs to the Red Tanks Member of the Bursum Formation, ~ 100m thick and mostly variegated shale, mudstone and siltstone of nonmarine origin, intercalated with some beds of limestone and shale of marine origin. Red Tanks Member fossils include palynomorphs, charophytes, plant megafossils, non-fusulinid foraminifers, fusulinids, bryozoans, brachiopods, gastropods, bivalves, nautiloids, eurypterids, ostracods, syncarid crustaceans, conchostracans, insects and some other arthropods, echinoids, crinoids, conodonts, fish ichthyoliths and bones of amphibians and reptiles. At stratigraphie levels 43m and 68m above the base of the section are Lagerst?tten of plants, insects, crustaceans, eurypterids and other fossils that form unique Late Paleozoic nearshore arthropod assemblages. Most of the fossil groups from the Red Tanks Member have been used to support diverse placements of the Pennsylvanian-Permian boundary at Carrizo Arroyo. We review previous placement of the Pennsylvanian-Permian boundary in the Carrizo Arroyo section and present newly collected insect and conodont data. The insects indicate that the two Lagerst?tten in the Red Tanks Member are of early Asselian age. The new conodont data include the presence of'Streptognathodus virgilicus in the uppermost part of the Atrasado Formation, which constrains its age to the middle to upper part of the Virgilian and to a comparable position in the Gzhelian. The only biostratigraphically-significant conodont assemblage in the Red Tanks Member comes from a marine horizon near the middle of the member, and the assemblage is probably equivalent in age to the Midcontinent Streptognathodus nevaensis Zone, of early to middle Asselian in age. A significant amount of latest Pennsylvanian to earliest Permian time apparently is not represented by rock record at the Carrizo Arroyo section, most likely at a major disconformity at the top of the Atrasado Formation and smaller ones at the bases of depositional sequences in the lower part of the Red Tanks Member. Conodont biostratigraphy provides compelling evidence that Bursum Formation deposition was not simply driven by glacio-eustatic cyclicity, but in this area it was partly overprinted by local tectonics.
机译：在美国新墨西哥州阿尔伯克基西南的Carrizo Arroyo，上古生界碎屑岩和碳酸盐岩约105米厚的断面产生了广泛的海洋和非海洋化石组合。卡里佐·阿罗约（Carrizo Arroyo）的大部分断层属于Bursum组的红色储层，厚约100m，主要是杂色的非海洋性页岩，泥岩和粉砂岩，中间夹有一些石灰岩和海相页岩。红罐成员化石包括古孢子虫，佛手藻，植物化石，非融合藻类有孔虫，融合藻，苔藓类，腕足类，腹足类，双壳类，鹦鹉螺类，类鳞茎类，兽类类，中生甲壳类，con类，con类，conc类，art科鱼鱼石和两栖动物和爬行动物的骨头。在该断层底部上方43m和68m的地层上，有植物，昆虫，甲壳类，eurypterids和其他化石形成的Lagersttten，它们形成了独特的近古生代近岸节肢动物节肢动物。 Red Tanks成员的大多数化石群已被用于支持Carrizo Arroyo的Pennsylvanian-Permian边界的不同位置。我们回顾了Carrizo Arroyo部分中宾夕法尼亚-二叠纪边界的先前位置，并提出了新收集的昆虫和牙形体数据。昆虫表明，红色坦克成员中的两个Lagerst？tten属于阿瑟时代。新的牙形体数据包括在Atrasado组的最上部存在'Streptognathodus virgilicus，这将其年龄限制在Virgilian的中部至上部，并限制在Gzhelian中。 Red Tanks成员中唯一具有生物地层学意义的牙形石组合来自该成员中部附近的海洋地平线，并且该组合的年龄可能与阿塞拜疆人中晚期的中陆链球菌（Streptognathodus nevaensis）带相同。在Carrizo Arroyo剖面上，岩石记录显然没有代表宾夕法尼亚州到二叠纪的最早时间，这很可能是Atrasado地层顶部的主要不整合面，而在Alsado组下部的沉积序列底部则是较小的不整合面。红色坦克会员。牙形石的生物地层学提供了令人信服的证据，表明Bursum形成的沉积不仅是由冰河－ Eustatic循环简单驱动的，而且在该区域它局部被局部构造覆盖。

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