Physical geology lecture outline - Igneous Rocks


rock -> naturally occurring aggregate of mineral matter.

Major divisions of rock types:


Igneous rocks in general:


Volcanic rocks


Plutonic rocks


Image of a sheet like (tabular) intrusion cutting the Madison limestone in Spearfish canyon in the Black Hills. This body is part of a suite of intrusions of Tertiary age found concentrated in the N part of the Black Hills uplift. Devil's Tower is a part of the suite.


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