惠水位于贵阳之南53公里处。其南之硐口为石炭系地层发育地段,该区在解放前为地质上之空白点。1959—1958年贵州地质局石油普查大队十一分队在此测制了地层柱状剖面图。由于没有系统采集化石和进行鉴定,将该区石炭纪地层粗略划分为中上石炭纪已及下石炭纪。前者统称为壶天灰岩,后者分为上部之冒沙井灰岩及下部之马鬃岭层,在岩性上可与贵阳东北 Huishui is located 53 kilometers south of Guiyang. The south of its entrance for the Carboniferous stratigraphic development, the area before the liberation of geological blank point. From 1959 to 1958, Eleventh Unit of the Guizhou Bureau of Geological Survey census produced a stratigraphic columnar section. Since there is no systematic collection and identification of fossils, the Carboniferous strata in this area are roughly divided into Upper Carboniferous and Lower Carboniferous. The former collectively referred to as Hu Tian limestone, which is divided into the upper part of the manhole limestone and the lower horse bristle ridge layer, in lithology and Guiyang northeast