lyo S. W. McCALLIE 



The Brasstown schist, where not displaced by faulting, has a 

 similar distribution to the Tusquitee quartzite, though it does not 

 extend so far south as the latter. It is made up of banded slate 

 and ottrelite schist having usually a dark, bluish color. Owing to 

 its limited distribution it is only of minor stratigraphic importance. 



The Valleytown formation consists of biotite schists, sericite 

 schist, and mica gneiss, with a few beds of quartzite and con- 

 glomerate. In the Ellijay quadrangle south of Cherrylog it is 

 described as a nearly homogeneous mass of sericite, mica schist, 

 and siliceous slate, with some talcose material. The occurrence 

 of graphitic schist beds are noted in the formation between Toccoa 

 River and Ellijay. The formation is usually valley-forming, 

 though north of Blue Ridge, extending to the state line, it forms a 

 rather prominent ridge, as well as the narrow valleys on either side. 



The Murphy marble, from an economic standpoint, is the most 

 important of the metamorphic group of rocks in the state. It con- 

 sists of holocrystalline limestone which in places becomes magnesian. 

 The magnesian phase of the formation is commonly fine-grained, 

 while the high- calcium phase is coarse-grained. It is usually 

 white but in places is more or less banded or mottled with black 

 owing to the presence of graphite. The formation enters the state 

 from North Carolina in the vicinity of Culberson, from which point 

 it continues southwest in one or more narrow belts, with a few 

 interruptions due to faulting, to a point a few miles beyond Tate, 

 Pickens County, the seat of Georgia's great marble industry. 

 Marble very similar in texture and composition occurs many miles 

 farther to the southwest in Haralson County, near Buchanan, 

 which is supposed to be the southern extension of the Murphy 

 marble. The formation is probably the equivalent of the Shady 

 limestone, an unaltered magnesian limestone hereafter to be 

 described. 



The Andrews schist is a comparatively thin, unimportant cal- 

 careous schist overlying the Murphy marble near the Georgia- 

 North CaroHna Hne, and like the overlying Nottely quartzite is 

 of very limited extent. It is made up almost entirely of dense 

 quartzite which is highly resistant to weathering and is therefore 

 ridge-forming. 



