Thursday, February 23, 2017

Thanks to the Legendary Geology Teacher and Grass Hockey Coach Ian Gibson

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 !

Ian Gibson