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首页> 外文会议>Multidisciplinary Conference >The Gray Fossil Site: A Spectacular Example in Tennessee of Ancient Regolith Occurrences in Carbonate Terranes, Valley and Ridge subprovince, southern Appalachians U.S.A.
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The Gray Fossil Site: A Spectacular Example in Tennessee of Ancient Regolith Occurrences in Carbonate Terranes, Valley and Ridge subprovince, southern Appalachians U.S.A.

机译：灰色化石网站：古代石油群岛田纳西州的田纳西州的一个壮观榜样，山谷和山脊子进口，南阿巴拉契亚州U.A.A。

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In May, 2000, the Tennessee Department of Transportation (TDOT) initiated a road-widening construction project on State Route 75 in Washington County in a region underlain by folded and faulted carbonate bedrock. The project involved deepening an existing shallow cut through a small hill (～20-30 m high) to remediate a blind intersection. During the course of excavation, the contractor removed several meters of yellowish-brown, chert-rich regolith across the crest of the hill and encountered an underlying soft dark-brown to black, fine-grained, graded to laminated, organic- and clay-rich deposit that presented a stability problem for road construction. Later drilling delimited thicknesses of at least 30 meters of these sediments surrounded and overlain by the yellowish-brown cherty regolith. Geological results suggest a steep-walled structure of karstic origin at one time existed within the original bedrock. Subgrade stability failures were anticipated and a remedial plan was recommended. In June, TDOT and Tennessee Division of Geology personnel made a major paleontological discovery on the road project/Unusually well preserved vertebrate fossils including tapir, elephant, rhinoceros, alligator, and a number of smaller vertebrates including fish, frogs, and turtles were identified by scientists from The University of Tennessee and East Tennessee State University. These are the first fossils of probable Late Miocene age discovered in Tennessee and constitute the largest and best-preserved terrestrial Late Miocene to Early Pliocene (ca. 7-3 Ma) localities known in the United States east of the Mississippi River. The site is a highly significant scientific, discovery, containing new species, including an animal related to the red panda, and the largest assemblage of tapir ever discovered. Abundant plant remains include leaves and leaf impressions, tree trunks, limbs, and twigs and seeds. In September, 2000, the Governor of Tennessee announced that TDOT would relocate a portion of the SR 75 road project to bypass the fossil-bearing sediments and preserve the site, which had been designated by the State Archeologist as the Gray Fossil Site. This action saves the site for scientific research and educational purposes, under the auspices of East Tennessee State University, but has mandated relocation efforts that are both expensive and time-consuming. Mounting evidence—especially in finds of fossil plants, but also lignite and other regolith—suggests that similar regolith deposits may exist in karst belts elsewhere within the Appalachians, where they may be encountered by future construction activities. Increased knowledge of localization factors for such features will aid in prospecting for infilled deposits so that they can be avoided during planning for future projects.
机译：2000年5月，交通运输的田纳西部门（TDOT）开始在华盛顿县州75号公路道路拓宽建设项目的区域下伏的折叠和断块碳酸盐岩床。该项目涉及通过一个小山丘（〜20-30米高）深化现有的浅切补救盲交集。在挖掘过程中，承包商去除黄棕色，丰富的燧石，壤几米整个山顶和遇到一个潜在的软黑褐色至黑色，细粒度，分级，层压，有机物和粘土丰富的存款是提出了公路建设稳定性问题。后来的钻这些沉积物由黄棕色燧石风化层包围，并覆的至少30米限定厚度。地质成果在原来的基岩中存在一个时间提示岩溶起源的陡峭壁结构。路基稳定性的故障进行了预期，并建议补救计划。今年六月，地质人员TDOT和田纳西州司提出在公路项目的一个主要的古生物发现/与众不同的是保存完好的脊椎动物化石，包括貘，大象，犀牛，鳄鱼，和许多较小的脊椎动物，包括鱼，青蛙和乌龟通过鉴定的科学家从田纳西大学和东田纳西州立大学。这些都是可能的晚中新世的化石首次在田纳西州发现并构成了最大，保存最完整的地面中新世晚期到上新世早期（约7-3马）在美国著名的密西西比河以东地区。该网站是一个非常显著科学，发现含有新物种，包括与小熊猫动物，貘和有史以来发现的最大的组合。丰富的植物遗存包括叶和印象，树干，四肢，树枝和种子。在2000年9月，美国田纳西州州长宣布，将TDOT搬迁SR 75公路项目的一部分绕过化石轴承沉积物和保护现场，已被国家考古学家指定为灰色化石遗址。此操作保存网站的科研和教育目的，东田纳西州立大学的主持下，但已经委托拆迁工作是既昂贵又耗时。越来越多的证据，尤其是在植物化石的发现，也褐煤等风化层，表明类似的风化层沉积物可能在中阿巴拉契亚山脉，在那里他们可以通过未来的建筑活动可能遇到的其他地区岩溶带存在。国产化因素等功能知识的增加将在勘探填充墙存款，使他们能够规划未来项目过程中应避免帮助。

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