Geological Map of the Surroundings of Lisbon, scale 1:50,000 (1935–1950)

The Geological Map of the Surroundings of Lisbon at a 1:50,000 scale, prepared by Paul Choffat, is an essential work for the study of the region’s geology. Published posthumously between 1935 and 1950 by the Geological Services of Portugal, the map, divided into four sheets, provides a detailed survey of the geological structure of the Lisbon area, highlighting the region’s main geological formations. This pioneering work by Choffat, a Swiss geologist who settled in Portugal, was crucial for understanding the local geological evolution and played a significant role in advancing geological scientific research in the country.