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首页> 外文期刊>Facies >Suspected microbial-induced sedimentary structures (MISS) in Furongian (Upper Cambrian; Jiangshanian, Sunwaptan) strata of the Upper Mississippi Valley
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Suspected microbial-induced sedimentary structures (MISS) in Furongian (Upper Cambrian; Jiangshanian, Sunwaptan) strata of the Upper Mississippi Valley

机译：密西西比河上游流域的芙蓉系（上寒武统;江山系，Sunwaptan）地层中疑似微生物诱导的沉积结构（MISS）

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摘要

The Furongian (Upper Cambrian; Jiangshanian and Sunwaptan) Tunnel City Group (Lone Rock Formation and Mazomanie Formation), exposed in Wisconsin and Minnesota, represents a shallow-marine clastic environment during a time of exceptionally high sea level. Lithofacies from shoreface to transitional-offshore settings document deposition in a wave- and storm-dominated sea. Flooding of the cratonic interior was associated with formation of a condensed section and the extensive development of microbial mats. Biolamination, mat fragments, wrinkle structures, and syneresis cracks are preserved in various sandstone facies of the Lone Rock Formation, as is evidence for the cohesive behavior of sand. These microbial- induced sedimentary structures (MISS) provide unique signals of biological–physical processes that physical structures alone cannot mimic. The MISS are associated with a trilobite extinction event in the Steptoean–Sunwaptan boundary interval. This may support recent claims that Phanerozoic microbial mats were opportunistic disaster forms that flourished during periods of faunal turnover. Further investigation of stratigraphic, taphonomic, and other potential biases, however, is needed to fully test this hypothesis.
机译：暴露于威斯康星州和明尼苏达州的芙蓉岩（上寒武统;江山纪和Sunwaptan）隧道城市群（孤岩组和马佐曼尼组）是海平面异常高的时期的浅海碎屑环境。从岸面到过渡到近海的岩相记录了在波浪和风暴为主的海中的沉积。克拉通内部的泛滥与冷凝段的形成和微生物垫的广泛发展有关。孤独岩层的各种砂岩相中都保留了生物层压，垫块碎片，皱纹结构和脱水收缩裂缝，这是砂土粘结性的证据。这些微生物诱导的沉积结构（MISS）提供了仅凭物理结构无法模仿的生物物理过程的独特信号。 MISS与Steptoean-Sunwaptan边界区间的三叶虫灭绝事件有关。这可能支持最近的论据，即生代微生物垫是在动物更新时期蓬勃发展的机会性灾难形式。但是，需要进一步研究地层学，地形学和其他潜在的偏差才能充分检验这一假设。

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