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渭北地区系指渭河以北陕西省中部而言。解放后,有不少地质人员相继来此进行工作,对含煤地层作了比较全面、系统的分析研究,但对G层铝土矿却重视不够。他们有的将其时代划属晚石炭世;有的与我国北方G层铝土矿对比而定其时代为中石炭世。1957—1959年我们在该区进行工作时,在铝土层及其下伏岩层中找到许多植物化石,有助于进一步确定G层铝土矿的地质时代。
The Weibei area refers to the central part of Shaanxi Province, north of the Weihe River. After the liberation, many geologists came to work in succession and made a comprehensive and systematic analysis of the coal-bearing strata. However, they paid insufficient attention to the G-strata bauxite. Some of them drew their times into the Late Carboniferous; some contrasted with the G-level bauxite in the north of our country and their era was Carboniferous. When we worked in the area from 1957 to 1959, we found many plant fossils in the bauxite and its subterranean formations, helping to further define the geological age of G-bauxite.