Changlin Fm

Its basal part is built up by yellow brown thick-bedded gravel-bearing sandstone and siltstone with gravel-bearing grit which is differentiated from the unconformable underlying Upper Permian dark gray quartz sandstone.

Its top part is bounded by the appearance of dark gray and gray massive dacite at the unconformable base of the Ezhai Fm. The Ezhai Fm has an eruptive-unconformable contact onto the Changlin Fm.

The formation is mainly distributed in Fuqing, Quanzhou, Gutian, Longxi and Dehua of eastern Fujian. It varies greatly in lithology and is dominated by dark gray, gray white and gray green tuffaceous sandy conglomerate, sandstone, siltstone with thin-bedded tuff, shale, siliceous rocks and coal streaks, of almost 1000 m thick. In the Huangtang area of Fuqing, it is represented by gray yellow siltstone and mudstone with banded siliceous rocks showing pyritization and carbonatization, with a thickness of 655 m. In the Luxi area of Putian, it is represented by gray siltstone, mud shale, tuffaceous siltstone and tuff, with a thickness of more than 402 m. In Xiashan of Xiapu, it is dominated by tuff with sericite commonly, measuring 365 m in thickness. In Jinquanzhai of Quanzhou, it is represented by light gray tuffaceous siltstone and mudstone with small amounts of crystal tuff, with a thickness of 310 m. In Qiantugan of Gutian, its lower part is represented by rhyolitic crystal tuff while its upper part gravel-bearing mudstone with a thickness of more than 98 m. In the vicinity of Dekeng of Longxi, it is built up by gray white, gray green and yellow green tuffaceous sandstone and sandy conglomerate with thin-bedded tuff and shale, locally carbonaceous, measuring 995 m thick. In Xiayun of Dehua and Xiabulao of Litian, it does not vary greatly in lithology and ranges from 80 to 960 m in thickness.