240 E. HAWORTH — THE OZARK UPLIFT AND ORB DEPOSITS 



principal mining localities are located around the border of this area in 

 such a manner that some relation between them and the uplift is 

 strongly implied. 



The Ozark area is monoclinal in character, with almost horizontal 

 strata on top of the dome and steeper inclinations on the sides. Various 

 degrees of fracturing resulted from the uplift movements, most pro- 

 nounced, however, around the borders, where the inclination of strata 

 is greatest, and in the flint areas, where the rocks were most brittle. No 

 volcanic phenomena accompanied the uplifting processes, nor was 

 regional metamorphism produced to any extent. The geologic age of 

 the formations concerned is of no special importance in connection with 

 the ore deposits, but the lithologic characters have had a marked influ- 

 ence on the extent to which fracturing has been produced, and therefore 

 on the abundance of ore deposition. The total absence of all kinds of 

 metamorphic minerals associated with the ores, excepting in the fissure 

 veins of the Archean granites, is in harmony with a like absence of vol- 

 canic phenomena, and strongly negatives the theory entertained by some 

 that the ores were deposited by hot waters brought up from great depths. 

 Future prospecting should be confined principally to the border areas. 



