Geologic Investigation of the Lewis Thrust System, Glacier National Park, Montana

刘易斯逆冲断层是加拿大南部落基山脉晚白垩世至早第三纪发育的主要构造要素之一，常被视为逆冲构造几何和运动学的经典例证。美国地质调查局（USGS）为更新冰川国家公园的地质而发起的测绘工作由于预算限制而过早结束，然而，相当复杂的结构的发现为这项研究提供了基础。通过构造作图和随后的运动学指标研究，将对序外逆冲形成的双断裂带的可能发育进行研究。结果将允许准确地记录路易斯系统断层之间的几何关系，从而全面重新评估这个重要的主要推力例子的历史。

The Lewis thrust fault is one of the major tectonic elements developed during late Cretaceous to early Tertiary time in the southern Canadian Rocky Mountains, and is often cited as a classic example to illustrate thrust geometry and kinematics. Mapping initiated by USGS to update the geology of Glacier National Park prematurely ended due to budget constraints, however, the discovery of considerable structural complexity provided the basis for this research. Possible development of a duplex fault zone developed by out-of-sequence thrusting will be investigated by structural mapping, and subsequent study of kinematic indicators. Results will allow accurate documentation of geometric relationships between the faults of the Lewis system leading to a full re-evaluation of the history of this important example of a major thrust.