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首页> 外文学位 >Cretaceous confluence in the Coon Creek Formation (Maastrichtian) of Mississippi and Tennessee, USA: Taphonomy and systematic paleontology of a decapod konsentrat-lagerstatte.
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Cretaceous confluence in the Coon Creek Formation (Maastrichtian) of Mississippi and Tennessee, USA: Taphonomy and systematic paleontology of a decapod konsentrat-lagerstatte.

机译：美国密西西比州和田纳西州库恩克里克组（马斯特里赫特）的白垩纪交汇处：十足动物konsentrat-lagerstatte的塔法学和系统古生物学。

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摘要

The Late Cretaceous (Maastrichtian) Coon Creek Formation of Mississippi and Tennessee possesses a diverse and abundant assemblage of decapods including lobsters, ghost shrimp, and crabs. The formation lies in a temporally and paleogeographically significant location, situated between the Atlantic Coastal Plain and the Western Interior Seaway, shortly before the closing of the seaway and the K-Pg Mass extinction.;Coon Creek decapods have been little studied since the fauna was first described in the 1920s. A large collection of specimens, ranging in preservation from poor to excellent, has recently become available for study. Because of the visible variation in preservation, the abundant material, and the paucity of cuticular data of this type of preservation, an investigative study of elemental composition of the sediment and cuticle of six species of decapod from six families (Palinuridae, Nephropidae, Callianassidae, Dakoticancridae, Raninidae, and Retroplumidae) is conducted using material collected at the Blue Springs Locality in Mississippi.;Cuticle, concretions, decapod burrow, and sediment from the site are analyzed with X-Ray Florescence and Elemental Reflectance for preliminary elemental composition and subsequent mineral composition. Concretions and the burrow were observed in thin section and were mapped for elemental distribution using Energy-dispersive X-Ray spectroscopy and dot mapping. The six species of decapod were analyzed using the same techniques. Taphonomic data supports preservation ranging from well preserved phosphatization to secondary alteration to silica-rich exterior and weathering clay minerals. Because the silica is not replacing the phosphatized exocuticle and microscopic structure of cuticle in cross section is not preserved in the silica layer, the cause of this alteration is uncertain. This preservation is un-like the decapod cuticle preservation of the concretions of the Bearpaw Shale Formation (Late Cretaceous) of Montana.;Species of the Coon Creek Formation were re-assessed and assigned to modern taxonomic schemes. Sixteen species are identified and two new species are described including Hoploparia tennesseensis, Hoploparia mcnairyensis, Linuparus new species, Linuparus sp., Palaeopetrochirus enigmus, Seorsus wadei, Bournelyreidus new species, Cristipluma mississippiensis, Hoploparia georgeana, Mesostylus mortoni, Tetracarcinus subquadratus, Avitelmessus grapsoideus, Cretacoranina testacea, New genus new species (Carcineretidae), Dakoticancer australis, Prehepatus harrisi, and Latheticocarcinus atlanticus. This decapod assemblage shares common species with correlative units of the Western Interior Seaway, the Gulf Coastal Plain, and the Atlantic Coastal Plain, supporting the hypothesis that the Mississippi Embayment is an ecotone for North American decapods.
机译：密西西比州和田纳西州的白垩纪晚期（马斯特里赫特式）库恩溪地层具有十足动物的丰富多样的组合，包括龙虾，鬼虾和螃蟹。该地层位于时间和古地理上重要的位置，位于大西洋沿海平原和西部内陆海道之间，在海道关闭和K-Pg大规模灭绝之前不久。最早描述于1920年代。最近，可供研究的标本种类繁多，保存范围从差到优。由于保存的明显变化，丰富的材料以及此类保存的表皮数据稀少，因此对六个科的十足足动物的十种脚底动物的沉积物和表皮的元​​素组成进行了调查研究。 Dakoticancridae，Raninidae和Retroplumidae）是使用在密西西比州Blue Springs地点收集的材料进行的;使用X射线荧光和元素反射率分析了现场的表皮，固结，十足类洞穴和沉积物，以获取初步的元素组成和后续的矿物组成。在薄截面上观察到了结石和洞穴，并使用能量色散X射线光谱和点图绘制了元素分布图。使用相同的技术分析了六个十足动物。谱数据支持从保存完好的磷化到二次改变到富含二氧化硅的外部和风化粘土矿物的保存。因为二氧化硅不能代替磷酸化的表皮，并且在二氧化硅层中没有保留横截面的微观结构，所以这种变化的原因是不确定的。这种保存方式与蒙大拿州Bearpaw页岩组（晚白垩世）的胶凝体的十足动物角质层保存不同。重新评估了Coon Creek组的物种并将其分配给现代分类学方案。鉴定出十六种，描述了两个新种，包括霍普球菌田纳西州种，霍普球菌属mcnairyensis，Linuparus新种，Linuparus sp。，古古猿enigmus，Seorsus wadei，Bournelyreidus新种，Cristipluma mississippiensis，Hoplopeumesmesvitpsypsoidsgrastuspsususususususus Cretacoranina testacea，新属新种（Carcineretidae），Dakoticancer australis，Prehepatus harrisi和Latheticocarcinus atlanticus。这种十足动物组合与西部内陆航道，墨西哥湾沿岸平原和大西洋沿岸平原的相关单位共有共同的物种，支持以下假设：密西西比河诱饵是北美十足动物的过渡带。

著录项

  • 作者

    Kornecki, Krystyna M.;

  • 作者单位

    Kent State University.;

  • 授予单位 Kent State University.;
  • 学科 Paleontology.;Geology.;Paleoecology.
  • 学位 M.S.
  • 年度 2014
  • 页码 203 p.
  • 总页数 203
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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