中三叠统在“三江地区”分布较为零星,藏东称之为瓦拉寺组,滇西称之为上兰组、臭水组。玉树地区由于研究程度较低,前人根据零星的瓣鳃化石已有所提及,但未取得可靠资料确定其存在。青海省第二区测队在该地区开展一比二十万区调工作中,先后在杂多县结扎及玉树县结隆附近(1976—1980)发现了可靠的中三叠世化石,并初步确定了地层层序。 Middle Triassic in the “Sanjiang area” distribution is more sporadic, Tibet called the Wara Temple Group, western Yunnan called Shanglan group, smelly water group. Due to the relatively low level of research in the Yushu area, previous reports have been made on the basis of sporadic petal gills but no reliable data have been obtained to confirm their existence. In the region of one to two hundred and twenty thousand regional transfer work, the Second Team of Qinghai Province discovered a reliable Middle Triassic fossil in the areas of Zaduo and Yushu Closure (1976-1980) Determine the stratigraphic sequence.