National Geological Map at 1:50.000 scale

The Geological Map of Spain, at scale 1:50.000 (MAGNA) between 1972 and 2003, constitutes the fundamental basis for the development of products and activities related to geological, hydrogeological resources, mineral resources, natural risk, and in general with any action on the physical environment. In 1993, an agreement was established between the Ministry of Industry, Trade and Tourism of the Junta de Andalucía and the Technological and Geominero Institute of Spain, for the digitisation of the sheets corresponding to the territory of Andalusia of the National Geological Map at 1:50.000 scale. The main objective of the agreement is to obtain the digital mapping of the geological, topographic and altymetric map contained in the sheet corresponding to the exact geometry of the edited map, and to obtain a digital sheet that includes all the elements of the edited sheet: geological map, geochronological and lithostratigraphic legend, legend of conventional signs, tectonic, geological or any kind of schemes, geological cuts, etc... The final result is a composition sheet similar to the edited sheet and mapping identical to the edited cartography. The geological map is divided by sheets at 1:50.000 scale, representing the geological information contained in that sheet. Geological information includes the different chronolithstratigraphic units of the corresponding sheet area separated by different types of contacts, normal or concordant, discordant and mechanical or intrusive. The tectonic structure is presented by the cartographic traces of the folds, the orientation and diverging of the flat and linear elements contained in the rocks, as well as by the structural relationship, through faults and rides, between the distinct rocky sets cartographically. Also, the singular characteristics of the igneous rocks are represented, as well as the degree of migmatisation of metamorphic rocks. Additional information includes water springs, or probes, mineral deposits and traces, the presence of fossils and other point-representing elements. The map is accompanied by the lithostratigraphic legend and conventional signs, and geological cuts and tectonic schemes. The digitisation process was carried out by blocks corresponding to areas defined and carried out successively over time by the Junta de Andalucía, some by the Technological Institute and Geominero of Spain others. For them there are some differences between the blocks, which have been corrected by a standardisation work.