2/2 J. C. BRANNER 



The pellets are in some place much larger, the biggest being 

 the size of one's two fists or even larger. 



Bauxite is sometimes compact. Mention should be made of 

 the fact that while one often sees small pieces of the compact 

 variety, there are, so far as I know at present, no beds or con- 

 siderable deposits of the compact kind in Arkansas. 



I have seen in the Royal College of Sciences in Dublin 

 specimens of the compact bauxite of Ireland. That material 

 looks very like a compact and homogeneous clay, and has no 

 evidences of pisolitic structure. Bauxite of this variety I have 

 not found in Arkansas. 



The heavy beds in Saline county are in some respects differ- 

 ent from those at the other Arkansas localities. In small frag- 

 ments this material is not distinguishable from that found near 

 Little Rock, but the beds are, in places, made up of what seem 

 to be cobbles or rolled and waterworn lumps of the same mate- 

 rial. Some of these lumps are as large as a man's head. 



Under the microscope one specimen shows the pisolites to 

 be concentric in structure, while here and there through them 

 are thin bands or veins of quartz. This suggests that the silica 

 found by analysis is sometimes free." 



Geologic age. — Bauxite has been found in Arkansas only in 

 Tertiary areas and in the vicinity of eruptive syenites with which 

 I believe them to be genetically related. This statement con- 

 cerning areal distribution must be accepted simply as a state- 

 ment of fact, but one that may be of considerable importance 

 in Arkansas, and possibly of none whatever in other bauxite 

 regions. The evidence of the Tertiary age of the Arkansas 

 bauxite is not abundant, but it all points in one direction. 



At the village of Ridgewood, about five miles south of Little 

 Rock, a well dug on lot 1 1 exposed the following section : 



Section of well on lot 1 1 , village of Ridgewood. — 

 3 feet surface soil. - 



7 feet pisolitic bauxite. , 



^For a good microscopic view see paper of C. W. Hayes in the l6th Ann. Rep. 

 U. S. G. S., Part III, Plate XXIII. 



