Geological boundaries represented as two dimensional lines (1:250,000)

Geological boundaries represented as two dimensional lines. Other geological features (e.g. fault or dyke) are included where the feature forms a boundary to rock units. The polygon edges are constructed from the corresponding geological contacts and faults layer地质边界以二维线条表示。其余地质特征（例如断层、岩脉）若构成岩石单元的边界，则一并纳入数据集。多边形边界由对应的地质接触带与断层图层构建而成。