庐山地区第四纪古雪蚀作用遗迹的发现

这一发现证实:第四纪冰期时北半球中纬度和中山地区古雪蚀作用是极重要的造貌和侵蚀营力,前人所谓的“表皮构造”,从剖面所处的海拔、谷地流向及应力方向看,均不能用冰川挤压作用来解释,不能证明庐山有过冰川作用。从所处的滨江滨湖地理位置看,基岩弧形弯曲现象与冬季积雪的重力挤压、春季融雪产生的冻融蠕动推挤力有关。

A NEW DISCOVERY OF QUATERNARY PALEO-NIVATION RELIC IN LUSHAN AREA

In recent field survey, the arc-shaped meandering phenomena of bed-rock squeezed by forces were found in 2 places of Yangtianping, Lushan Area. The phenomena have ever been named as "Epidermis Structure" by some scholars. Based up on the altitude and running direction of valley as well as the stress direction, it can not be interpreted with glacial processes, hence, it can not be regarded as a proof of glacial action in Lushan Area. On the contrary, according to the location bordered on Changjiang River and Poyang Lake, it was caused by gravity press of snow accumulated in winter and wriggle press derived from the freeze and melt processes of snow in spring. As a result, it demonstrates that paleo-nivation process is the important construction forces of land-form genesis in middle latitude area of northern hemisphere in Quaternary Glacial Period.