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长宁县的双河镇是长宁的旧县洽,位于四川省的西南部。这里的奥陶纪地层曾经石油部门和地质部门的不少单位研究过,分层系统是沿用黔北和鄂西的地层名称。但就岩
Shuanghe, Changning County is the old county of Changning, located in the southwest of Sichuan Province. The Ordovician strata here have been studied by many units in the petroleum department and geological department. The stratified system follows the stratigraphic names of northern Guizhou and western Hubei. But on the rock