Dacites sentence example
dacites
- Among the Tertiary volcanic rocks those of acid types (granites, granulites) were the first to appear and are developed latitudinally; rocks of intermediate type (dacites, andesites) characterize the Miocene and early Pliocene periods; while the basic rocks (ophites, elaeolite syenites and basalts) attained their maximum in later Pliocene and Quaternary times.
- The whole of this consists of tuffs and lavas, andesites prevailing in the west and rhyolites and dacites in the east.
- The rocks are liparites, dacites, hornblende and pyroxene andesites.