National Geological Map at 1:50,000 scale

The Geological Map of Spain, at a scale of 1:50,000 (MAGNA) carried out 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, Commerce and Tourism of the Junta de Andalucía and the Technological and Geominer Institute of Spain, for the digitisation of the sheets corresponding to the territory of Andalusia of the National Geological Map at 1:50,000.
The main objective of the agreement is to obtain the digital mapping of the geological, topographic and altimetric map contained in the corresponding sheet with an exact geometry to 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 sheet of composition similar to the edited sheet and cartography identical to the edited cartography.
The geological map is divided by leaves at 1:50,000 scale, in which the geological information contained in that sheet is represented.
Geological information comprises the different chronolithostratigraphic 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 through the cartographic traces of the folds, the orientation and dipping of the planar and linear elements contained in the rocks, as well as by the structural relationship, through faults and rides, between the differentiated rock sets. Also, the unique characteristics of igneous rocks are represented, as well as the degree of migmatisation of metamorphic rocks. Additional information includes water springs, or surveys, mineral deposits and indications, the presence of fossils and other elements of punctual representation. The map is accompanied by 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 and Geomining Institute of Spain others. There are some differences between the blocks, which have been corrected by a normalisation work.