Late Pliocene and Quaternary Stratigraphy, Tephrochronology and Magnetostratigraph of Loess and Tephra, Central Alaska

采用新的等温平台裂变径迹方法， 对韦斯特盖特开发的火山灰层进行年代测定， 用于表征（指纹）个体的详细方法 火山灰层，并概述了古地磁地层的 黄土，计划制定一个可靠和详细的 300万年黄土序列年代地层格架 丰富的火山灰床，植物和动物遗骸附近 费尔班克斯，阿拉斯加。 长期研究的黄土暴露现在将是 能够被绑在一起，创造一个名副其实的“罗塞塔石碑”， 允许详细的地质、生物和气候的年代测定 阿拉斯加内陆环境变化的记录 新生代时期。 这一记录可以广泛地与 从育空地区到东西伯利亚。 阿拉斯加州在黄金建立了黄土研究保护区 费尔班克斯附近的山丘，黄土记录可以追溯到300万年前 也许是世界上最古老的。 在三个详细的 在这个地方挖的调查沟，只有一个是完全 研究;古地磁测年是需要对其他两个。 还有， 在众多火山灰中只有两个被确定了年代。 继续 详细的沉积学、火山灰年代学和 在这个和其他暴露附近的古地磁地层学工作 费尔班克斯将加强初步的年代地层 概述了黄土沉积的漫长而寒冷的时期的框架 在苔原环境中散布着森林环境， 间冰期

By using the new isothermal plateau fission-track method of dating tephra layers developed by Westgate, by applying a proven detailed method for characterizing (fingerprinting) individual tephra layers, and by outlining the paleomagnetostratigraphy of the loess, it is planned to develop a reliable and detailed chronostratigraphic framework for the 3 million year loess sequence with the abundant tephra beds, and plant and animal remains near Fairbanks, Alaska. The long-studied loess exposures will now be able to be tied together to create a veritable "Rosetta Stone", permitting the dating of detailed geologic, biologic, and climatic records of environmental change in interior Alaska for late Cenozoic time. This record then can be widely correlated from the Yukon to eastern Siberia. The State of Alaska has created a Loess Study Preserve at Gold Hill near Fairbanks where the loess record extends back 3 million years, perhaps the oldest in the world. Of the three detailed investigation trenches dug at this site, only one is completely studied; paleomagnetic dating is required on the other two. Also, only two of the many tephra have been dated here. Continued detailed sedimentologic, tephrochronologic, and paleomagnetostratigraphic work at this and other exposures near Fairbanks will strengthen the preliminary chronostratigraphic framework outlining the long, cold time periods of loess deposition in tundra environments interspersed with forest environments of interglacial times.