G3Dv3.1 0317, fractions in basis Fm van Tienen

This layer gives the fractions through the base of the Formation of Tienen, as defined in the Geological 3D model of the Flemish subsurface - version 3.1. The Geological 3D model was drawn up in the framework of the management agreement of the Flemish government with VITO, under the name VLAKO, on behalf of the Flemish Environmental Planning Bureau.该图层提供了蒂嫩组地层（Formation of Tienen）基底的组分占比数据，其定义源自佛兰德斯地下地质三维模型3.1版。该地质三维模型由佛兰德斯环境规划局委托，在佛兰德斯政府与VITO签署的管理协议框架下，以VLAKO项目之名编制完成。