Mt Baldy is an Intrusive Igneous feature - this means that a mass of magma cooled
beneath the surface and after it had solidified it was pushed up by tectonic forces. The
way to tell if it is intrusive is to look at the rock - if there are visible crystals then the
molten rock cooled slowly in an underground setting. Volcanic rocks cool quickly on the
surface and will not have visible crystals.
The rocks in the Mt Baldy area have lots of visible crystals and therefore cooled
underground. I have lived here for many years and I am amazed at how many people tell
me Mt Baldy is a volcano - maybe we should just agree with them ??? All the best !