answer:
Between around 500 and 400 ka within the present-day Hole Lake locale, rhyodacite magma streams and domes erupted in a number of short-lived scenes, and Mount Mazama is characterized as the built upon these 400 ka magmas. Mount Mazama was shaped as a progression of covering cones and shields amid a period of generally nonstop volcanic movement that kept going nearly half a million a long time, from almost 420 to 40 ka. The primary emissions built Mount Scott, found fair east of Cavity Lake.
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