Systematic Affinities and Biogeographic Relationships of Fossil Floras from the Eocene Clarno Formation of Oregon

俄勒冈州始新世克拉诺植物群， 精心保存的水果、种子、树叶 和其他植物器官，提供了一个重要的联系， 热带到亚热带始新世植物群横跨北方 半球 果实和种子植物群是无与伦比的， 北美第三纪的多样性和质量 保存，并提供了一个很好的基础比较， 英格兰和欧洲第三纪早期和中期， 种子储备更丰富，研究更深入， 在北美 同样多样的克拉诺叶组合 便于与其他美洲和亚洲国家进行比较 第三纪植物群 资金将用于支持持续的实地工作， 克拉诺湖相组合分析。 最近收购 克拉诺许多植物区系的放射性测定年代 增加了这项工作对生物地层对比的价值 其他地区的北方半球，并进行微调 植物区系演化年代学和古气候变化 太平洋西北部

The Eocene Clarno flora of Oregon with its large assemblanges of exquisitely preserved fruits and seeds, leaves and other plant organs, provides an important link in correlating tropical to subtropical Eocene floras across the Northern Hemisphere. The fruit and seed flora is unparalleled in the Tertiary of North America for diversity and quality of preservation, and provides an excellent basis for comparison with the early and mid-Tertiary of England and Europe, where fruit and seed deposits are more abundant and more thoroughly studied than in North America. The similarly diverse Clarno leaf assemblages facilitate comparison with other American and Asian early Tertiary floras. Funding will support continued field work and analyses of Clarno lacustrine assemblages. Recently acquired radiometeric dates for many of the Clarno floral localities increase the value of this work for biostratigraphic correlation of other regions of the Northern Hemisphere, and for fine-tuning the chronology of floral evolution and paleoclimatic change in the Pacific Northwest.