“西宁组”一名,‘系由“西宁系”(Loczy.L1899年)一名演译而来。系指一套在干旱气候条件下形成的、内陆湖泊相红色碎屑岩(含盐)建造。对其时代,由于以往未发现任何有意义的化石,(*)故分岐较大,有作为上新世在西北地区的代表,而置于咸水河组之上,也有将其定为中新世,与咸水河组相对比的。近几年,我队在民和～西宁盆地,作了一些野外地质工作,测制了西宁组地层剖面 “Xining group ” a, ’from’ Xining Department ’(Loczy.L 1899) a speech from. This refers to a suite of red clastic rocks (salt) formed in arid climatic conditions in inland lakes. For its time, because of the absence of any meaningful fossils in the past, (*) the divergence is so large that it has been placed above the salt water group as a representative of the Pliocene in the northwestern region, World, compared with the salt water group. In recent years, our team made some field geological work in Minhe-Xining Basin, and measured the stratigraphic profile of Xining Formation