The sanwan opeirogeny is marked by the regional disconformity - angular overlapping unconformity below the upper triassic sanqiutian and yangmeilong formations , while the sandu opeirogeny is recorded by the regional disconformity - angular overlapping unconformity below the upper triassic zaoshang , duojiang and tanglong formations 三灣造陸運動以上三疊統三丘田組、楊梅垅組之下的區域性假整合-角度超覆不整合為標志;三都造陸運動以上三疊統造上組、多江組、唐垅組之下的區域性假整合-角度超覆不整合為特征。