290 KANSAS UNIVERSITY QUARIERLV. 



Winslow,* and also Keys,f while discussing this subject assume 

 that the coastal area was subsiding rather than the ocean area. By- 

 such assumptions it is difficult to understand how such a condition 

 could result in producing the uniform western dip which character- 

 izes all the formations in the Kansas Coal Measures. But a still 

 greater difficulty is met in accounting for the westward progression 

 of the marginal areas. Had the coastal borders continuously subsided 

 the marginal areas would as continuously have migrated landward, 

 while the facts are they migrated oceanward at a sufficient rate to 

 equal 125 miles during the formation of 2200 feet of sediments, as will 

 be seen by comparing the Cherokee shales with the Osage City shales. 

 In this way the point O in figure i also migrated oceanward and 

 upward which would assist all the more in accounting for the west- 

 ward dip over the present areas of high elevation. 



*Mo. Geol. Surv. Rep.. Coal, IHUI, pp. 21-32. and Bull. G. S. A.. Vol. III. pp. 109-121. 

 tia. Geol. Surv. Rep.. Vol. II, 1891. 



