NOTES ON THE GEOLOGY OF GEORGIA 173 



found thin layers of feldspathic sandstone and quartzite, but these 

 form only a minor part of the formation as a whole. 



The Apison shale consists of varicolored argillaceous shales 

 developed only in limited, elongated areas in Whitfield and Catoosa 

 counties. Although the Apison is evidently approximately equiva- 

 lent to the Cartersville formation in age, the exposures are in the 

 western part of the valley. 



The Rome formation consists of sandstone and shale and is con- 

 fined to two belts near the center of the Appalachian Valley. The 

 main belt, which is rarely more than two miles wide, extends from 

 near Cave Spring, Floyd County, northeast through Rome to a 

 point within about three miles northwest of Calhoun in Gordon 

 County. The other belt commences near Villanow in Walker 

 County and continues to the Georgia-Tennessee line a few miles 

 northeast of Ringgold. A third belt which Hayes placed in this 

 formation on the basis of stratigraphic position is above described 

 as the Cartersville formation. Immediately overlying the Rome 

 formation and apparently without any stratigraphic break are the 

 only representatives of Upper Cambrian, namely the Conasauga 

 formation and the lower division of the Knox dolomite for- 

 mation. 



The Conasauga formation, with the exception of the Knox 

 dolomite, covers the largest surface area of any of the Cambrian 

 series of Georgia. It is especially well developed along the eastern 

 side of the Appalachian Valley, where it occurs in two main elon- 

 gated but broad belts. The easternmost of these belts continues 

 south from the Georgia-Tennessee line from Tennga to a point a 

 few miles south of Cartersville, where it is cut off by the Carters- 

 ville fault, while the other belt, after being divided into minor 

 belts and at points uniting with the easternmost belt, continues 

 to the Alabama state line by way of Rome. Farther to the west 

 are three narrow belts, one of which, lying to the west, traverses the 

 entire northwestern corner of the state by way of Lafayette. The 

 upper part of the formation is made up largely of olive-green and 

 yellowish-green argillaceous shale, but the lower part consists 

 mainly of grayish and bluish limestones locally oolitic and inter- 

 stratified with the shale. The Conasauga formation contains an 



