Yucamane is constructed on a basement formed by the Paleozoic Tacaza Group (lavas of the lower Tacaza formation), the Jurassic Yura Group (sediments of the Hualhuani formation) and the Neogene volcanic Huaylillas formation; parts of this basement crop out on the southern side of Yucamane. This basement in turn consists of two major tectonic blocks, the southern Arequipa terrane and the northern Paracas massif; both are formed by igneous and metamorphic rocks such as gneiss and are covered by Mesozoic sedimentary and Cenozoic volcanic rocks.