论文部分内容阅读
贺兰山位於宁夏的东部,黄河的西岸,是一个南北延展的孤立山脉。依照地形上来看,可以约分为三段:北段为壮年期地形。山高谷深,坡度甚陡,分水岭狭窄。三关以北属之。三关至野猫子山为中段,地势平坦,孤山远布,为老年期之地形。野猫子山以南,在广阔的平顶山中,常有狭深的山谷,显为另一侵蚀循环的幼年期地形。贺兰山的地层,大部为华北式的,就是各地质时代地层的岩石性质及所含化石,完全与华北所见地层相同,譬如老的变质岩就与桑乾系相同;震旦纪的石灰岩就与南
Helan Mountain is located in the eastern part of Ningxia, the Yellow River West Bank, is a north-south extension of isolated mountains. According to the terrain point of view, can be divided into about three sections: the northern section of the terrain for the prime of life. Deep valleys, steep slopes, narrow watersheds. Three off north of it. Three off to the wild cat mountain for the middle, flat, Gushan far cloth for the geriatric terrain. Wild cat mountain south of the vast flat-topped mountains, often deep valleys, showed another erosion cycles of juvenile topography. Helan Mountain strata, most of the North China-style, that is, the geology of the geological age of the rock properties and fossils, completely the same as the North China see stratum, such as the old metamorphic rocks and Sanggan the same; Sinian on the limestone And south