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徽成盆地系秦岭中部,展布于陕西凤县,甘肃徽县、成县、武都一带的中、新生代沉积盆地。盆地西部成县一带较宽,约40公里;东部凤县地区则变窄,仅4公里左右,故盆地呈一棒锤状(图1),为秦岭山系中最大的一个沉积盆地。盆地中广泛分布着中、新生代陆相地层(图1),早白垩世地层则为盆地中最发育、分布面积最广的一套陆相含煤沉积。它主要出露于两当杨家店和凤县以东、以及成县至武都甘泉一线以南的广大地区。早在20世纪30年代初,赵亚曾、黄汲清(1931)将出露于陕西凤县一带之故道河俗称
The Huicheng Basin is located in the central part of the Qinling Mountains and is distributed in Meso-Cenozoic sedimentary basins in Fengxian, Shaanxi, Huixian, Chengxian and Wudu areas in Shaanxi Province. The western part of the basin has a wide area of about 40 km. The Fengxian area in the east narrows only about 4 km. Therefore, the basin has a hammer-like shape (Figure 1). It is the largest sedimentary basin in the Qinling Mountains. The Meso-Cenozoic terrestrial strata are widely distributed in the basin (Figure 1). The Early Cretaceous strata are the most developed and widely distributed continental facies deposits in the basin. It is mainly exposed in two when the Yangjiaodian and Fengxian east, as well as to the county of Wudu Ganquan south of the vast area. As early as the early 1930s, Zhao Yazeng and Huang Jiqing (1931) will be exposed to the name of the ancient river in Feng County, Shaanxi