WEATHERING OF THE PIEDMONT
50-56 million years ago
of the rocks of the Piedmont generated large volumes of kaolinitic
clays, quartz sand and mica, as well as minor amounts of other
minerals, especially iron and titanium oxides, such as limonite
and anastase. Feldspar, a major component of granitic rocks such
as those at Stone Mountain near Atlanta, is considered the parent
material for most of Georgia's sedimentary kaolin.