陕西省“编表编册”领导小组受“西北区编表编册”领导小组委托,于一九七六年三月二十九日～四月八日由陕西省地质局负责,在西安召开了“西北区前寒武纪断代会议”,会议制定了《西北区前寒武系划分对比方案》。作为大区编制地层表时遵循的统一方案,现将有关问题说明如下。(一)关于前寒武系统一划分方案问题 Shaanxi Province, “List Compilation” leading group by the “Northwest Table Editor,” the leading group commissioned in March 29, 1976 to April 8 by the Shaanxi Provincial Bureau of Geology responsible for holding in Xi’an The “Precambrian Disastrous Meeting in the Northwest Region”, the conference formulated the “Comparison Program of Precambrian Division in Northwest China.” As a unified program to be followed in the preparation of stratigraphic tables in large areas, the relevant issues are explained as follows. (A) on the Precambrian a division of programs