Marine/Non-Marine Stratigraphy and Environments in the Plio-Pleistocene of Florida

佛罗里达的西南沿海地区是 最丰富的贝类海洋动物群 五百万年的生物进化。 这 音程之所以引起人们极大兴趣，是因为它的基本原理 环境和生物变化，包括关闭 巴拿马海道，墨西哥湾流重组，切断 太平洋-大西洋海洋动物群之间的联系， 北美和南美陆地动物群的交流。 最近佛罗里达州立博物馆的工作表明， 丰富的陆地动物样本与水井交错 佛罗里达西南部已知的海洋软体动物群。 这些 脊椎动物样本将被放大和研究，他们是 预计将大大提高目前的日期精度 整个新第三纪晚期的层序 在同一 时间，密集的分析，很大程度上被忽视的腹足类 海洋动物区系中的软体动物。 相对 一种新的方法来检查这些相同的海洋 和非海洋动物群将尝试使用锶同位素 比例，与基于世界范围的序列相比， 海洋读数 这项工作是紧迫的，因为主要 现在开放的挖掘将被关闭，永远埋葬在大约 两年

The southwest coastal region of Florida offers one of the richest sequences of shelly marine faunas representing the last five million years of biological evolution in the region. This interval is of great interest because of its fundamental environmental and biotic changes including closure of the Panamanian seaway, reorganization of the Gulf Stream, severing of the Pacific-Atlantic connection between marine faunas and the interchange of North and South American land faunas. Recent work by Florida State Museum parties has shown that potentially rich land animal samples interfinger with the well- known marine mollusk faunas in southwest Florida. These vertebrate samples will be enlarged and studied, and they are expected to greatly improve the precision of present dating of the entire late Neogene sequence in the region. At the same time, intensive analysis of the largely neglected gastropod mollusks in the marine faunas will be undertaken. A relatively new approach to checking the correlation of these same marine and non-marine faunas will be tried, using strontium isotope ratios, in comparison with the sequence based on world-wide marine readings. This work is urgent because the major excavations now open will be closed and forever buried in about two years.