Primary deposits occur in acidic granitic magmas and pegmatites. During and after sedimentation large granitic plutons intruded the crust. These rocks were pervasively intruded by magmas now forming granitic rocks. The Cuchivero Group consists of ash flow tuff and granitic plutonic rocks. It is predominantly Mesozoic granitic and pre-Cretaceous metamorphic rocks. Grinding stones were made of quartzite, granitic, or metamorphic rock. Elsewhere, granitic gneiss is dominant. The plateau consists of thick sandstone formations that overlie granitic basement rock. Wolframite is found in quartz veins and pegmatites associated with granitic intrusives. Metavolcanic rock and diabase underlie areas around the granitic zone. It is particularly common in granitic pegmatites. These gneisses were penetrated by a number of granitic bodies during the Carboniferous period. These soils are well-drained, moderately coarse-textured soils derived from alluvium from granitic rock. There are also peritectic and residual minerals in granitic magmas. They unconformably lie upon Precambrian granitic and gneissic rocks.