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一兴隆洼遗址和赵宝沟遗址均位于内蒙古自治区东南部赤峰市敖汉旗境内(图一),这一地区地处燕山山脉东段的努鲁儿虎山北麓、老哈河以南,在大的地理单元上属内蒙古高原的东部边缘,为西辽河上游的西拉木伦河流域,是内蒙古高原向松辽平原过渡的斜坡地带。地势西高东低,西部为中山,向东渐变为低山、丘陵、直至平原,海拔为700～1100米。西拉木伦河发源于内蒙古高原,自西向东流经这一地区,沿主河及其支流广泛发育有两级阶地。在西拉木伦河的中下游,主河以南有广泛的黄土堆积,它们覆盖在不同的地貌部位上,形成黄土台塬、黄土丘陵和黄土谷地。在主河以北,有大片的沙地分布,属科尔沁沙地的一部分。本地区的主要河流除西拉木伦河及支流老哈河、教来河、查干木伦河外,北面还有
A Xinglongwa site and Zhaobaogou sites are located in Aohanqi, Chifeng City, southeastern Inner Mongolia Autonomous Region (Figure 1). This area is located in the northern foot of Nuluerhushan in the eastern section of the Yanshan Mountains, south of Laohe River, On the large geographical unit belongs to the eastern edge of the Inner Mongolia Plateau, the West Lalun River Basin upstream of the West Liaohe River, is the slope of the transition from Inner Mongolia Plateau to the Songliao Plain. The terrain is high in the west and low in the east, Zhongshan is in the west and gradually changes to low mountains and hills to the east, reaching the plains at an altitude of 700 to 1100 meters. The Xilamulun River originates from the Inner Mongolia Plateau and runs through this region from west to east. There are two stages of development along the main river and its tributaries. In the middle and lower reaches of the West Lamulun River, there are extensive loess deposits south of the main river. They cover different landforms and form loess plateau, loess hills and loess valleys. To the north of the main river, there is a large area of sand distribution, which is part of Horqin Sandy Land. The main rivers in the region are Xilamulun River and tributary Laoha River, Jiaolai River, Chaganmulun River and the north