This range includes at least nine caldera complexes, more than 70 of Chile's stratovolcanoes and volcanic fields that have been active in the Quaternary, and hundreds of minor eruptive centers.
32.
A few isolated volcanic centers northwest of Mount Meager, such as the Silverthrone Caldera, which is a wide, deeply dissected caldera complex, are considered by some geologists to be the northernmost member of the arc.
33.
A few isolated volcanic centres northwest of Mount Meager, such as the Silverthrone Caldera, which is a circular wide, deeply dissected caldera complex, are considered by some geologists to be the northernmost member of the arc.
34.
The oldest identified caldera remnant straddles the border near McDermitt, Nevada-Oregon, although there are arcuate faults that define caldera complexes more than in diameter in the Carmacks Group of southwest-central Yukon, Canada, which are interpreted to have formed 70 million years ago by the Yellowstone hotspot.
35.
"' Franklin Glacier Volcano "'is a deeply eroded and huge long and wide caldera complex in southwestern British Columbia, Canada, located east-southeast of the Silverthrone Caldera in the Hoodoo Creek and Franklin Glacier area on the northwest flank of the dikes and high-level magma intrusions.
36.
The Long Valley Caldera in eastern California is also a complex volcano; the San Juan Mountains in southwestern Colorado are formed on a group of Neogene-age caldera complexes, and most of the Mesozoic and Cenozoic rocks of Nevada, Idaho, and eastern California are also caldera complexes and their erupted ash flow tuffs.
37.
The Long Valley Caldera in eastern California is also a complex volcano; the San Juan Mountains in southwestern Colorado are formed on a group of Neogene-age caldera complexes, and most of the Mesozoic and Cenozoic rocks of Nevada, Idaho, and eastern California are also caldera complexes and their erupted ash flow tuffs.
38.
It could be another 1-2 million years ( as the North American Plate moves across the Yellowstone hotspot ) before a new supervolcano is born to the northeast, and the Yellowstone Plateau volcanic field joins the ranks of its deceased ancestors in the Snake River Plain . ( References to be added : Kathryn Watts ( Nov 2007 ) GeoTimes " Yellowstone and Heise : Supervolcanoes that Lighten Up " : Kathryn E . Watts, Ilya N . Bindeman and Axel K . Schmitt ( 2011 ) Petrology, Vol . 52, No . 5, " Large-volume Rhyolite Genesis in Caldera Complexes of the Snake River Plain : Insights from the Kilgore Tuff of the Heise Volcanic Field, Idaho, with Comparison to Yellowstone and Bruneau-Jarbidge Rhyolites " pp . 857 890 ).
