<P> Stone Mountain is a pluton , a type of igneous intrusion . Primarily composed of quartz monzonite , the dome of Stone Mountain was formed during the formation of the Blue Ridge Mountains around 300 -- 350 million years ago ( during the Carboniferous period ) , part of the Appalachian Mountains . It formed as a result of the upwelling of magma from within the Earth 's crust . This magma solidified to form granite within the crust five to ten miles below the surface . </P>
<P> Stone Mountain is a pluton , a type of igneous intrusion . Primarily composed of quartz monzonite , the dome of Stone Mountain was formed during the formation of the Blue Ridge Mountains around 300 -- 350 million years ago ( during the Carboniferous period ) , part of the Appalachian Mountains . It formed as a result of the upwelling of magma from within the Earth 's crust . This magma solidified to form granite within the crust five to ten miles below the surface . </P>
what type of geologic feature is stone mountain
what type of geologic feature is stone mountain
a pluton , a type of igneous intrusion
a pluton , a type of igneous intrusion