在地质历史时期中,曾有过生机盎然、森林茂密的时代,我国的华北、东北、西北如今的鄂尔多斯高原等也曾是一片土地肥沃、森林茂盛的地方。冰川的袭击,使生长在这里的大片森林遭到劫难,绝大多数都消失了。可如今在辽宁阜新与内蒙古后旗(?)处,有一个神密的深谷——大青沟。沟内古木参天,野生动物出没,仍保存着原始森林的模样。大青沟是怎样形成的呢?地球历史发展到第四纪时,辽西、内蒙古东部再次出现了森林繁盛期,给这片沃土披上了绿装,同时也给这里的食草动物猛犸象、披毛犀、野牛等提供了得天独后的物质条件。它们成群结队地出没有在辽西、内蒙古东部的广大地域,无忧无虑地生活着,繁衍着。可好 During the geological history, there was an era full of vitality and dense forests. The Ordos Plateau in North China, Northeast China and Northwest China nowadays was once also a fertile land with flourishing forests. The glacier attacks caused catastrophes in the vast forests that grew here, and most disappeared. But now in Fuxin, Liaoning and Inner Mongolia Houqi (?) Office, there is a dense deep valley - Daqing ditch. Ditch towering old trees, wildlife haunt, still preserved the appearance of the original forest. Daqing ditch is formed? Earth history to the Quaternary, western Liaoning, eastern Inner Mongolia once again appeared in the forest prosperous period, to this piece of fertile soil put on green equipment, but also to the herbivore here Mammoth, Coat rhinoceros, bison provides the unique material conditions. They are in droves in the western Liaoning, Inner Mongolia, vast areas, carefree life, reproduction. OK