Structural, Geochronologic and Stratigraphic Studies of Paleogene Extension, Idaho and Montana

小行星9317395 该项目将测试的理论，在始新世和渐新世时代有一个基本的构造边界，什么是西南蒙大拿州和中东部爱达荷州，在一个狭窄的形式，N-走向半地堑。 半地堑及其沉积充填物的结构和地层分析结合40Ar\39Ar地质年代学将确定结构的区域范围，以及它们是否是由于塞维尔造山带中先前增厚的地壳的碎裂坍塌而形成的。 研究结果对全球造山系统的演化具有广泛的应用价值。

9317395 Janecke This project will test the theory that in Eocene and Oligocene times there was a fundamental tectonic boundary, between what is how SW Montana and east-central Idaho, in the form of a narrow, N- trending half-graben. Structural and stratigraphic analyses of the half-graben and its sedimentary fill combined 40Ar\39Ar geochronology will ascertain the regional extent of the structure (s) and whether or not they formed due to fraintational collapse of previously thickened crust in the Sevier orogenic belt. The results will have wide application to the evolution of orogenic systems world-wide ***