In addition to its production of large lava flows , Newberry Volcano has also produced a number of Plinian eruptions similar to the eruption of Vesuvius that destroyed Pompeii and Peléan eruptions like the 1902 explosion of Mount Pelée . These include a number of caldera-forming eruptions , producing ash flow deposits including the Tepee Draw tuff and Black Lapilli tuff , and rising or more into the stratosphere . The last of these eruptions covered tens of thousands of square miles with ash , extending to the San Francisco Bay Area in California nearly to the southwest . Here , it reaches a thickness of one centimeter . Additionally , Newberry has produced multiple , voluminous explosive eruptions , with certain studies estimating up to 60 eruptive events of rhyolite and dacite tephra that reach Idaho , Utah , and northern California . These include the eruption that produced the Paulina Creek tephra between 55,000 and 50,000 years ago , and the eruption from 20,000 years ago responsible for the Wono tephra , which extends into western Nevada and east-central California . As a result of compositional zoning within the magma chamber that feeds the volcano , its ash deposits may show different chemical and mineralogical makeups . The last of these tephra eruptions yielded the Newberry pumice just before 1,300 years ago , reaching several hundred miles to the east
eruption of Vesuvius
Eruption of Mount Vesuvius in 79
Newberry Volcano