RUI -- COLLABORATIVE RESEARCH: Integrated Stratigraphic Study of Cambrian-Ordovician Inner Shelf Facies of the Western United States

RUI——合作研究：美国西部寒武纪-奥陶纪内陆架相的综合地层研究

• 批准号: 9902812
• 负责人: John Taylor
• 金额: $ 7.76万
• 依托单位: Indiana University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902812&HistoricalAwards=false
• 关键词: RUI; COLLABORATIVE; RESEARCH; Integrated; Stratigraphic

9902812TaylorPeriodic extinctions of Laurentian platform invertebrates in the Late Cambrian have been attributed to changes in sea level and other paleoceanographic events. Such hypotheses are testable but require a more precise and complete biostratigraphic, sedimentologic, andchemostratigraphic data set than is currently available. A thorough sequence-stratigraphic analysis of Upper Cambrian and Lower Ordovician inner shelf successions in the western United States will provide such a data set. Sub-meter scale sampling for trilobites, conodonts, and Carbon isotopes will provide a highly-refined chronostratigraphic framework in which to test the posited coincidence of faunal change with times of sea level rise or fall and/or oceanic overturn. Additionally, comparison of relative sea level curves constructed for the western (Wyoming and Montana) and eastern (southwestern US) paleoshelves will test the validity of numerous eustatic events that have been proposed for the Late Cambrian and earliest Ordovician.

9902812 taylor晚寒武纪Laurentian台地无脊椎动物的周期性灭绝被归因于海平面的变化和其他古海洋事件。这些假设是可以检验的，但需要比目前更精确和完整的生物地层学、沉积学和化学地层学数据集。对美国西部上寒武统和下奥陶统内陆架序列进行彻底的层序地层分析将提供这样的数据集。三叶虫、牙形刺和碳同位素的亚米尺度采样将提供一个高度精细的年代地层框架，用于测试假定的动物变化与海平面上升或下降和/或海洋翻覆时间的巧合。此外，对比西部（怀俄明和蒙大拿）和东部（美国西南部）古陆架的相对海平面曲线，将检验在晚寒武纪和早奥陶纪提出的许多海平面上升事件的有效性。