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Géologie & hydrogéologie /Geology & Hydrogeology

Geology and Hydrogeology

The traditional geological map is the basic document and, obviously, was the first to have been produced. It indicates, for a given area, the age of deposition or formation of the outcropping or sub-outcropping rocks, and the rocks' petrographic type based on three major categories: sedimentary, metamorphic and magmatic, with the last being subdivided into intrusive (or plutonic: granite, diorite, gabbro, etc.) and extrusive (or effusive: rhyolite, andesite, basalt, etc.). The chronostratigraphic age (stage or other time subdivision) is given by a palette of colours supplemented by a notation of corresponding symbols. The magmatic rocks, and more especially the metamorphic rocks, are characterized by a whole range of overprints. The geological map provides a relatively static picture, a sort of photograph of surficial geological objects resulting from processes that took place in the three dimensions of space and the depth of time.

CGMW hydrogeological maps provide to the general public a global view of the location and regional distribution of the most significant aquifers shared between several countries, main rivers and groundwater resources basins, especially those in the planet's arid belt those. They are aimed at the non-specialist map users who are involved in one capacity or another, and notably among the decision makers at policy level.