Digital Geological Map of the Upper Laja River Basin, Guanajuato, Mexico

Abstract

A new geological map of the Upper Laja River Basin at 1:200,000 scale is presented, covering an area of ∼11,600 km² in the northern part of Guanajuato. This map was edited based on local and regional geological studies available in the literature, photo interpretations, field verification of contacts and faults and structural data acquisition. The main objective of this map is to provide a regional geological framework for future local geological and hydrological studies in the region. It displays the geology of the basin, divided into seven chronostratigraphic groups, as well as the main faults that shape the basin. In contribution to the geological knowledge of the area, five new U-Pb ages are presented, obtained from samples collected at the eastern and western edges of the basin.