Abstract
Tahan-chi River flows through the southern part of the Taoyuan Prefecture located on the south of Taipei City, and Shihmen Dam, which is the largest water reservoir in Taiwan, is located there. Pliocene strata of the Kueichulin Formation and the Chinshui Shale, and Pleistocene strata of the Cholan and Yangmei formations are exposed about four kilometer long on the downstream side of the reservoir. The succession was basically formed by a transgression and a regression in the foreland basin of Taiwan Collision Zone. The upper part suggests upward swallowing from shelf condition to barrier island and river systems. However, we can find several small cycles of transgression and regression in this succession.
