242 C. R. KEYES — CRUSTAL ADJUSTMENT IN MISSISSIPPI VALLEY. 



In the Coal Measures of some parts of the region the shps are usually 

 of small extent, but much more numerous than has been generally sus- 

 pected heretofore. 



There are also numerous dislocations, but without marked displace- 

 ment. 



In the case of many of the small faults the stresses may have been 

 superinduced by the diminution in bulk of lenticular coal beds at hori- 

 zons somewhat lower than those in which they occur. 



