On some topics, if you question five geologists you will probably receive five or more variant answers. Much of geology is interpretational. It is much more difficult to compile those details into a picture of a region's geologic history, and to describe how a region's geology fits into Earth's history of 4.5 billion years.
Geologists interpret old, complex, and corrupted evidence.
Particularly, metamorphic rock is difficult to assess. Metamorphic rock may have been so changed that we can only estimate its original form, or the processes that changed it. Of course, most rock in Piedmont and Blue Ridge Georgia is metamorphic. References listed below illustrate how our understanding of Georgia geology has changed since advancement of plate tectonic theory in the 1960's, and how it continues to change. I have listed publications of which I have direct knowledge.