Age and Paleogeographic Implications of a Pre-Tertiary Flora in the Blue Mountains, Northeastern Oregon

首席研究员将收集和研究侏罗纪植物群 它是最近在一个前第三纪的异地发现的 美国俄勒冈州东北部蓝山山脉中的一群印第安人。 初步 对这些化石的几个小集合的检查表明， 该植物群由保存完好的叶痕和 代表各种蕨类植物，种子蕨类植物， 苏铁银杏和针叶树 对该植物群的详细研究 将提供新的数据来检验前第三纪 蓝山的火山起源于赤道附近 随后数百甚至数千人流离失所， 在与北美克拉通相撞前的某个时候 在中生代。 此外，这项工作将建立年龄的 植物群，信息应该阐明的时间， 这些人的行动。 该项目将强调比较 蓝山植物群与其他中生代植物群的关系 可能是相关的，特别是侏罗纪和早白垩世 植物区系，已被描述，从许多地方周围的边缘， 太平洋盆地 此外，一般的古气候 将对植物群的需求进行评估，以便了解一些情况 它可能生活的气候环境

The principal investigator will collect and study the Jurassic flora which was recently discovered in one of the allochthonous pre-Tertiary terranes in the Blue Mountains of northeastern Oregon. A preliminary examination of several small collections of these fossils has shown that the flora consists of both well preserved leaf impressions and permineralized wood representing a variety of ferns, seed ferns, cycadophytes, ginkgos, and conifers. A detailed study of this flora will provide new data to test the hypothesis that the pre-Tertiary terranes in the Blue Mountains originated in a near-equatorial location and were subsequently displaced hundreds or even thousands of kilometers before colliding with the North American craton sometime during the Mesozoic. Also, the work will establish the age of the flora, information which should shed light on the timing of the movements of these terranes. The project will emphasize a comparison of the Blue Mountain flora to other Mesozoic floras to which it might possibly be related, especially the Jurassic and Lower Cretaceous floras that have been described from many localities around the rim of the Pacific Ocean basin. In addition, the general paleoclimatic requirements of the flora will be evaluated in order to learn something about the climatic regime in which it probably lived.