THE ESTABLISHMENT OF THE QINGBAIKOU’AN LOWER KASHA FORMATION IN ShuiLO AREA,MULI,SICHUAN

When sorting stratigraphic units,it is found that the Muzuo Forrnation defined by predecessors in fact includestwo sequences of strata and that the time span of the Iower sequence-the series of metavolcanic rocks and pyro-clastic-continental clastic rocks-should be Qingbaikou’ an. So it is necessary to separate it from the Muzuo Forma-tion and establish a new lithostratigraphic unit the Lower Kasha Formation. This paper describes the stratotypesection of the Lower Kasha Formation.