Gaowu Fm

Its base marked by dark gray dacitic brecciated vitric ignimbrite is distinguished from the gray purple rhyolite of the underlying Dashuang Formation. It lies conformably with the underlying strata.

Its top is bounded conformably by the occurrence of gray thin- to moderately thick-bedded tuffaceous silty mudstone.

The formation occurs in the Longquan-Fenghua and Wenzhou-Xiangshan area of southeast Zhejiang. It is quite persistent in thickness, generally ranging from 800 to 1000 m, 3000 m at maximum in Dayan of Fenghua. In most areas there occur simple massive volcanic rocks, locally with small amounts of sedimentary rocks and intermediate and acidic lava. In Weicun of Lishui, Dashangang of Quzhou, Luofangqiao of Jinghua, Dalingjiao of Zhenhai, Shuangjian of Yiwu and Lizhai of Dongyang there is a number of sedimentary partings in ignimbrite some of which are about 100 m thick. In Fengshuping of Wencheng and Baishuipiao of Qingtian there exist 4-50 m thick rhyolite and to east of the Longtoukeng Village there occurs a andesite bed.