Elementary polygons of the hydrogeological entity stack - Guyana

An elementary polygon corresponds to a stack (or stack) characteristic of hydrogeological entities. According to Sandre, dictionary of the SAQ hydrogeological repository version 2.2基础多边形（elementary polygon）对应于水文地质实体（hydrogeological entities）所特有的堆叠特征（stack）。 据Sandre编撰的SAQ水文地质资源库2.2版词典。