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

俄勒冈州始新世克拉诺组包含了多种多样的 化石果实、种子、木材和树叶的组合。 虽然 在始新世植物地理学的讨论中经常被引用，只有 克拉诺植物群的一小部分已经被描述。 因为它包含了几种保存下来的植物结构 在各种各样的沉积环境中， 从辐射测量学上讲，克拉诺组合具有潜在的重要性， 作为联系北方始新世植物群的纽带 半球 克拉诺植物群的综合处理 包括生殖结构和叶子， 早第三纪植物群的洲际对比 产于欧洲，主要产于水果和种子， 产于亚洲和北美洲，以叶子闻名。 的 由此产生的数据集将提供更好的理解 大陆内和大陆间植物区系的相对一致性 始新世的北方半球 植物地理迁移的时间和方向。

The Eocene Clarno Formation of Oregon contains a diverse assemblage of fossil fruits, seeds, woods and leaves. Although frequently cited in discussions of Eocene phytogeography, only a small percentage of the Clarno flora has been described. Because it contains several kinds of plant structures preserved in a variety of depositional settings that can be dated radiometrically, the Clarno assemblage is potentially important as a link in correlating Eocene floras across the Northern Hemisphere. A comprehensive treatment of the Clarno flora including reproductive structures and leaves will facilitate intercontinental correlations between the early Tertiary floras of Europe, known mostly from fruit and seed deposits, and those of Asia and North America, best known from leaves. The resulting data set will provide a better understanding of relative intra- and intercontinental floristic uniformity in the Northern Hemisphere during the Eocene and insight into the timing and directions of phytogeographic migrations.