一、引言2009年10月,重庆中国三峡博物馆古人类研究所开展重庆主城周边高位阶地旧石器考古调查时发现了大山坪地点,2010年4月对其进行了拉网式复查。该地点位于重庆市合川区云门镇大山坪,距嘉陵江和渠江交汇处约1.5千米,地理坐标为北纬30°2.70730′,东经1 06°20.72445′,海拔425米(图一)。该地点分布面积仅限于弧状山头的顶部,约3000平方米,为河流阶地被剥蚀、丘陵化的残留,采集石制品105件。二、地貌与地层合川区地处川中丘陵和川东平行岭谷的交接地带。全境有两种地质构造类型·境 I. INTRODUCTION In October 2009, the Institute of Paleoanthropology of the Three Gorges Project in Chongqing, China, discovered Dashaoping Site during the archaeological investigation of the Paleolithic high-level terraces surrounding the main city of Chongqing. In April 2010, it conducted a pull-net review. The site is located in Dashanping, Yunmen Town, Hechuan District, Chongqing City, about 1.5 km from Jialing River and Drainage Canal interchange with geographical coordinates of 2.70730 ’north latitude, 106 ° 20.72445 longitude and 425 meters above sea level (Figure 1). The area is only limited to the top of the arc-shaped hill, about 3,000 square meters, the denudation and hilly residues of the river terrace, the collection of 105 pieces of stone products. Second, the topography and strata Hechuan District is located in the middle of Sichuan and Sichuan Ridge Ridge Valley handover area. There are two types of geological structure throughout the territory