Yao Tandong, Li Jijun
This paper deals with problems arisen from former "glacial relics" in the Lu Shan which often puzzled brains of many geologists and geographers, at home and abroad.Using the data collected from both field works and laboratory analyses, we get some ideas quite different from that of prof. Lee J.S. (李四光) Firstly, we find that the Da-Ao cirque occurring north side of Dayue Mountain, has nothing to do with the form of a typical glacial cirque.There is no rock basin with a threshold on the lip,and also no back wall in sheer face can be found.Its side walls are rather steep indeed, but just near the lip a tight anticline consisted of hard sandstone strata occurs, which probably could account for the steep side walls and even the development of the cirque itself. Moreover, the value of the form ratio (F) is 10.8 for Da-Ao cirque, and 8.2 for Huanglong cirque.These values are much too high for a glacial genetic cirque. Similarly, we found that the values of form ratio of troughs in the Lu Shan (Fr = D/W) are hardly possible to be taken as indicator for their galcial origin.Generally, the so-called troughs in the Lu Shan are too shallow,which means no overdeepening happened during the the time they were being sculptured.All the above mentioned facts conflict with the maritime environment of the Lu Shan both in glacial past andpresent.The major part of the paper is devoted to the analyses of the features of the deposits in the Lu Shan region according to sedimentology,the analysesinclude:1.Fabric features including the changes of the lithological characters,the gravel shapes and the preferred orientations of long axis and a/b plane.2.The features of particle-size shown by the parameters,the diagrams of the dots of the parameters and the frequency curve, of the particle-size. To study the original mechanism of boulder clay in; the Lu Shan this paper cit es numerous research results of the valley glacial deposits and the debris-flow deposits at home arid abroad, comparing with the features of boulder clay in the Lu Shan.It is quite clear that the glacial theory is not suitable to explain the genesis of landscape and boulder clay in the Lu Shan, and more works are nee ded to find a way to bring us back to reality.