A huge slab of the triassic intrusion of the palisade diabase ( also known as tap rock ) broke off these prominent cliffs ( over 300 ft or 90 m high in places ) several days before this picture was snapped .

一块三叠纪年代侵入岩浆岩壁辉绿岩（又称为龙头岩石）的巨大厚板在拍摄这张照片几天前已经从这些突出的悬崖（某些地方高度超过了300英尺或90米）上掉了下来。

The purpose of this paper is to explore land reclamation modes that meet the requirements of sustainable development at a region level , which takes zhenggou diabase production area of hunyuan county , shanxi province as example .

研究目的：以山西省浑源县正沟辉绿岩产区为研究对象，探索符合区域可持续发展的复垦模式。