The Georgia Bauxite Deposits. — Watson. 39 
placement of part of the alumina l\v ferric oxide further shows 
the presence of both metals in the original solution, but invari- 
able quantities at dififerent times and places." 
"Upcai the subsequent decomposition of the Knox lime- 
stone, the calcareous matter being removed, the ores were con- 
centrated, leaving accumulations of bauxite more prominent 
than in the original beds." 
"The position of the bauxite appears to be more or less in 
pockets and lenticular masses in certain strata, and if workings 
are ever carried beneath the decayed rocks, the mineral will 
likely be found in pockets in compact limestone. Indeed, some 
of the apparent clays may be found to be the soluble aluminous 
mineral, which is so far as known in Georgia, generally more or 
less oolitic and concretionary, as are the iron and manganese 
deposits. The bauxite beds or pockets are less interrupted, and 
are much more extensive than the latter named mineral." 
Brieflv summarized Dr. Spencer's explanation for the ac- 
cumulation of the bauxite deposits is: (a) The source of the 
alumina was from the crystalline rocks of central Georgia; (b) 
the alumina was carried to its present place by carbonated or 
alkaline waters and precipitated in the lagooiis in which the 
ferruginous and manganiferous limestones were being formed ; 
and (c) the ore w^as further concentrated ujwn weathering of 
the Knox limestone, the soluble calcareous material of which 
was removed in solution, and the insoluble aluminous material, 
bauxite, was accumulated and left more prominent than in the 
original beds. 
This theory fails to explain the following essential condi- 
tions and characteristic modes of occurrence of the Georgia de- 
posits. ( I ) The deposits are compact ore-bodies existing in 
the form of well-defined pockets and, as a rule, with the vertical 
nearl\- equal to the horizontal dimensions. This mode of oc- 
currence cannot l)y any known ])rocess ajjply to the accumu- 
lation of ore-bodies resulting from weathering. (2) The re- 
lationship of the bauxite and its associated kaolins to tJie sur- 
rounding residual siliceous material. Tn no instance has the 
gradation from the bauxitic clav into the inclosing residual 
clays been observed ; but on the contrary, the line between the 
two is at all times definite and ]:)ronounced. The two types of 
clav bear no reseml^lance to each other. Furthermore the ore- 
