Progress, Problems and Prospects on the Stratigraphy and Correlation of the Kungurian Stage, Early Permian (Cisuralian) Series
Progress, Problems and Prospects on the Stratigraphy and Correlation of the Kungurian Stage, Early Permian (Cisuralian) Series
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DOI：
10.1111/j.1755-6724.2011.00407.x
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
Yue Wang;Jing Wang;Jun Chen;Weijie Wang;S. Shen;C. Henderson
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文献类型：
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作者：
Yue Wang;Jing Wang;Jun Chen;Weijie Wang;S. Shen;C. Henderson
昆古阶是二叠纪剩余的三个阶段之一，尚未由全球层型剖面和点 (GSSP) 定义。乌拉尔 Yuryuzan 河的候选河段几乎没有牙形刺，并且在边界附近包含非海洋沉积物。寻找合适的、连续的海洋层序是二叠纪地层小组委员会的主要任务。伦纳德阶的典型区位于美国西南部，客观地层序列位于瓜达卢普阶路阶基底的正下方，优先作为下二叠统的一个亚系。然而，明显的地方主义限制了伦纳德化石区与基于熔丝的特提斯时间尺度的相关性。牙形刺可以在盘古大陆两侧的许多重要区域中进行关联，但是当将牙形刺区域与梭状和菊石区域联系起来时，就会出现矛盾。不同的分类哲学被高度怀疑是造成冲突的原因，而且也存在与西德克萨斯州的Roadian类型不同的牙形刺。鉴于中亚的帕米尔高原和达尔瓦兹地区难以进入，进一步的调查应集中在华南地区，那里丰富的fusulines和菊石有助于整个特提斯地区的相关性，并且那里的牙形刺允许与北美进行相关性。
The Kungurian Stage is one of the three remaining stages of the Permian that is not yet defined at the base by a Global Stratotype Section and Point (GSSP). The candidate section at the Yuryuzan' River in the Urals yields few conodonts, and contains non‐marine sediments near the boundary. The search for a suitable, continuous marine succession is a principal task for the Subcommission on Permian Stratigraphy. The Leonardian, with its type area in the southwest United States, and in objective stratigraphic succession directly beneath the basal Guadalupian Roadian Stage, has priority to serve as a subseries of the Lower Permian. However, distinct provincialism limits the correlation of Leonardian fossil zones with the fusuline‐based Tethyan timescale. Conodonts can be correlated in many important regions on opposite sides of Pangea, yet contradictions arise when relating conodont zones with fusuline and ammonoid zones. The different taxonomic philosophies are highly suspected for the cause of the conflicts, but also there are different conodonts from the type Roadian in West Texas. Given that the Pamir and Darvaz in central Asia are difficult to access, further investigations should focus on South China, where abundant fusulines and ammonoids facilitate correlation throughout the Tethyan region, and where conodonts permit correlation with North America.