哈密地区,在远古时代很多地方都处在火山的活动带上。解放后,据地质科学工作者的考察得知,哈密远古时期的火山群,有不同地质年代的火山喷发,拥有多种火山地貌景观。火山口与火山地貌因时代遥远,绝大多数已难寻当年的踪迹。只是石炭纪的海底火山,尚可找到一些零星的呈浅碟状与坑穴状的特殊地形。哈密的古火山,主要分布在地质断裂构造带上。火山将大量的二氧化碳、二氧化硫和硫化氢释入大气,有时以爆发状喷出,有时又随构造裂隙安静地流出。如今仍能看到的火山只有伊吾淖毛湖乡北山的一对孪 Hami area, in ancient times many places are in the volcanic activity belt. After the liberation, according to the investigation by the geoscienceists, the ancient volcanic groups in Hami have volcanic eruptions of different geological ages and have various volcanic landscapes. Crater and volcanic landscape due to the distant ages, the vast majority have been hard to find the traces of the year. Only the Carboniferous submarine volcano, can still find some sporadic shallow dish and pit-shaped special terrain. Hami ancient volcano, mainly distributed in the geological fault zone. Volcanoes release large amounts of carbon dioxide, sulfur dioxide and hydrogen sulfide into the atmosphere, sometimes in explosive form and sometimes quietly flowing out of structural fractures. The volcano that can still be seen today is only a pair of twins in the north mountain of Mao Lake Township