Pleistocene Interglacial Marine Climates, U.S. Mid-Atlantic and Southeastern Coastal Plains

该项目将研究大西洋沿着的海洋气候 三个中更新世和晚更新世期间的美国海岸 间冰期 该项目将有两个主要目标：1） 制作详细的季节温度范围记录， 间冰期时的弗吉尼亚和南卡罗来纳州海岸 时期，和2）潜在地改善这些年表 利用锶同位素地层学研究海侵事件 季节性古温度范围将根据 化石稳定氧（O）和碳（C）同位素剖面 软体动物的壳 将测量壳生长增量， 确定贝壳停止生长的时期，从而截短贝壳 同位素分布 生长增量数据还将用于 评估一个独立的古温度计的基础上的地理 个体发育生长趋势的变化。 更新世海侵大西洋的时间 沿海平原是一个积极的辩论的主题， 氨基酸消旋和铀系的解释 测年方法 锶同位素分析包括在 建议的项目应提供一套独立的数据， 这些单位的地质年代。 所有地球化学分析将在同一个 已经分析过氨基酸外消旋化的标本，所以 气候和地质年代学信息将直接 可比性

The project will examine the marine climate along the Atlantic Coast of the U.S. during three middle and late Pleistocene interglacial periods. The project will have two main goals: 1) produce detailed records of seasonal temperature ranges for the Virginia and South Carolina coasts during these interglacial periods, and 2) potentially improve the chronology of these transgressive events using strontium-isotope stratigraphy. The seasonal paleotemperature ranges will be calculated from the stable oxygen ( O) and carbon ( C) isotope profiles of fossil mollusk shells. Shell growth increments will be measured to identify periods of cessation of shell growth that truncate the isotope profiles. The growth increment data will also be used to assess an independent paleothermometer based on the geographic variation in ontogenetic growth trends. The timing of the Pleistocene transgressions onto the Atlantic Coastal Plain is the subject of an active debate over various interpretations of amino acid racemization and uranium-series dating methods. The strontium isotope analyses included in the proposed project should provide an independent set of data that addresses the geochronology of these units. All geochemical analyses will be performed on the same specimens that have been analyzed for amino acid racemization, so that the climatic and geochronologic information will be directly comparable.