GRGC: Post-Illinoian Vegetational & Climatic History of the Middle West: Comparisons with the European History

Wright, Herbert, Ito, Emi，明尼苏达大学GRGC：中西部的后伊利诺伊植被和气候历史：与欧洲历史的比较pi，与伊利诺斯州地质调查局合作，将进行花粉分析，涵盖从倒数第二个冰期到最近的间冰期，直到现在（过去的13万年），在北美中部最后一个冰川的范围以南。在伊利诺斯州南部的一个干涸的湖盆上，将采取一个岩心的样带。将对花粉（详细）、介形类和植物大化石进行分析；碳-14测年、岩性和其他地球化学分析也将进行。结果将与类似的欧洲研究和海洋沉积物-冰原体积记录相关联。植被的显著变化表明在这段时间里气候发生了显著变化，并对理解急流迁移、降水和树木迁移率的历史（作为日照和气候的指标）具有重要意义。

EAR-9316628 Wright, Herbert, Ito, Emi, Univ. of Minnesota GRGC: Post-Illinoian vegetational and climatic history of the Middle West: Comparisons with European history PIs, in collaboration with the Illinois Geological Survey, will conduct pollen analysis covering the time from the penultimate glaciation through the latest interglacial, up to the present (the last 130,000 years), south of the extent of the last glacier in central North America. A transect of cores will be taken across a drained lake basin in southern Illinois. Analyses will be conducted of pollen (in detail), as well as of ostracodes and plant macrofossils; C-14 dating, lithologic, and other geochemical analyses will also be done. Results will be correlated with similar European studies and with the marine sediment-core record of ice sheet volume. Striking variations in vegetation suggest conspicuous climate changes during these times and have implications for understanding, for example, the history of jet stream migration, precipitation, and tree migration rates as indicators of insolation and climate.