One sheet, in Spanish. The base map shows drainage patterns and the locations of volcanic rocks, intrusive rocks, and paleozoic rocks. The map uses color-coded symbols to show the locations of deposits, calderas, and faults and the type of deposit. Size is 56 x 78 cm. Geologic Quadrangle Maps.
Numerous sheets cover northwestern Peru.
The maps are well-made with good detail. The text discusses the geologic setting of the area, and the stratigraphic, geochemical, and isotopic age data. Each sheet measures 95 x 86 cm. In hardbound book.