THE BARITE DEPOSITS OF MISSOURI 43 



breccias are well exposed. The part of the fault plane exposed 

 still retains the polish produced by the movement (PI. VI, B). 

 The best exposure was one where the fault plane has a strike of 

 N. 46° E. and dips 76° S. E. Another good exposure on Fertile 

 Creek shows a strike of N. 80° E. and a dip of 75° S. The other 

 faults are more nearly vertical than these two. 



The fault on the north side of the block, the Mineral Fork 

 fault, stands out prominently on the face of the bluff on Big 

 River in the southeast quarter of Sec. 22, T. 39, R. 3 E. The 

 north end of the bluff is made up largely of the Potosi dolomite 

 while the south end is entirely of the Elvins formation. Since 

 the Potosi soils are red and the upper part of the bluff has suf- 

 ficiently gentle slopes to retain some soil, its color is red, and it 

 is locally known as the "Red Bluff," and that part occupied by 

 the Elvins formation is known as the "Gray Bluff." 



The total throw at the eastern end of the block is less than 

 that of the central part. A short cross fault running from north- 

 east to southwest separates the two parts. The total throw is 

 about 100 feet. The Kingston fault, striking southeast of King- 

 ston, is a differential fault, the greatest movement having been 

 at the northern end where it intersects the hidden fault on Min- 

 eral Creek. Much difficulty was found in locating, even approx- 

 imately, this fault and the One on the east side of this particular 

 block. The actual fault planes were not located and the 

 structural relationships were the only available means of de- 

 termining their existence. There is a strong probability that the 

 Kingston fault is a continuation of the sharp flexure in Furnace 

 Hollow. There may be a connection between the two anticlines 

 and this faulted zone, which is loccited at their intersection and 

 southeast of it. 



The Stony Point area. — These faults were worked out by 

 Buckley and belong to a large distributive fault called by him the 

 Big River fault. The downthrow is on the northwestern side. 

 On the corner of the area included in this map there are two 

 rudely parallel faults. The extreme southeastern corner is occu- 

 pied by the lower part of the Elvins formation (the Davis of 

 Buckley), and in the area between the two faults the upper El- 

 vins formation outcrops. These beds dip about 30° N. W. and 



