Three interesting geological map items, showing at least a part of Transylvania, are introduced in this work: the Herbich map (1878) of the historical Siculia, the 1896 and 1922 maps of the historical Hungary. The map of Herbich is the first member of the famous map series of the freshly founded Royal Geological Institute of Hungary. The 1896 map is the first one showing also Transylvania according to the Bologna geological color standard. The 1922 map shows also the territories east and south of the Carpathians and was printed in 35 color shades, which is a record of the maps of this region, too. The geological content of the maps is compared in this work as well as the method and results of the georeference of these maps into the modern GIS systems.

 

geological maps, Transylvania, map colors, map signs, georeference, map projections, Romania, Hungary