The Georgia Bauxite Deposits. — IVatsoii. 27 
ga and Walker counties, Georgia. The above belt forms a 
part of the well known Coosa valley region in Georgia and 
Alabama. The ore has been mined at various points within 
this belt in both states. 
The area in question forms a part of the southern exten- 
sion of the Appalachian valley province. When viewed in 
detail it is composed of numerous subordinate valleys separat- 
ed by more or less extensive parallel ridges, whose axial di- 
rections are coincident with the general trend of the valley 
province. This ridge-valley type of topography is definitely 
related to the rock structure of the area. The ridges mark the 
lines of more resistant rock, while the valleys are etched out 
of the soft shales and limestones. The ridges further mark 
the remnants of at least three rather distinct base-leveled 
plains, which are believed to have a direct bearing on the age 
relationship of the deposits, discussed elsewhere.* 
In addition to the folds of the usual Appalachian type the 
region is characterized by two series of faults with which the 
bauxite distribution is very intimately associated ( see map 
plate vii). The two types of faults are designated by Hayesf 
as (a) major thrust faults, and (b) minor thrust faults. The 
major thrust faults are characterized by great horizontal dis- 
placement and low inclination of the fault plane. Tliree faults 
of this type have been recognized and described by Hayes in 
this area, namely, the Coosa, Rome and Cartersville faults. 
The minor thrust faults are very common in the southern 
part of the area 'and are of the ordinary Appalachian type. 
They have an approximate north-south direction, iiatersecting- 
the main axis of the region at angles of 30" to 40°, and are 
characterized by rather steep inclinations of the plane, 40° or 
thereabouts. They vary in length from three to eight miles 
and cut the strata, at close intervals, into narrow strips form- 
ing monoclinals, which dip steeply toward the east. For the 
reason that the two types of faults are seldom found inter- 
secting each other the faulting is inferred to belong to dilYer- 
ent and therefore distinct periods of disturbance. 
•Hayes, C. Willakd, Op. cit. pp. .551-.''<54. 
tlbid. The Overthrust Faults of the Southern Appalarhinns, litillctin, (icol. 
Soc. Amer., 1891, vol. ii, pp. 141-1.')4-. 
n^id, Geolojrv of a Portion of the Coosa Vsillev in (reorjiia and AIjibaiiKi. 
Bull»tin, Geol. Soc. Amer., 1894-, Vol. G, pp. 465-480. 
