6 KANSAS UNIVERSITY SCIENCE BULLETIN. 



beds, and thinks it probable that many of the properties of the 

 plains marl are largely due to the action of wind. 



In the region mapped the loess was found in valleys having 

 a north-and-south direction. This may be due to the fact that 

 a wind from the west, carrying the material, would deposit it 

 in valleys lying north and south, while it would not accumulate 

 in valleys having an east-and-west direction. 



DISCUSSION OF THE MAPPING. 



The mapping began at the Kansas-Nebraska line. Here the 

 contact was concealed by 60 to 100 feet of drift. Just west of 

 the Little Blue river, opposite Hollenberg, the Permian was 

 exposed near the 1300-foot contour, while east of this town the 

 Dakota rocks were exposed near the same level. Thus, in a 

 general way, the contact is at the 1300-foot level between the 

 state line and Washington west of the Little Blue. On the 

 west bank of Mill creek there is a deposit of Pleistocene, cover- 

 ing the slope. The region is mapped as Cretaceous rock, 

 though there is little doubt that it is material washed from 

 the higher hills to the west. A tongue of Dakota extends north 

 in the area between Mill creek and this river. If the sugges- 

 tion that Mill creek formerly had its outlet to the south is true, 

 this tongue would probably be an outlier. 



On the east side of the Little Blue are outliers within six 

 miles north and south of Hanover, but inside the boundaries 

 of Washington county. South of Washington the contact rises 

 nearly to the 1400-foot line, but west of that place pitches 

 down, so that the Permian extends up Mill creek only two 

 miles. The contact is found in the valley of Beaver creek, at 

 an elevation of about 1375 feet. At Greenleaf, owing to the 

 presence of the old channel noted above, neither Permian nor 

 Dakota is exposed, but the former is only thirty feet below 

 the level of the town a few miles east and west. Across this 

 area the contact is dotted. 



From Greenleaf to Clifton there is a continuous dip to the 

 west. There is an outlier of Dakota in the vicinity of Chep- 

 stow, and it also extends south into the extreme northwest 

 corner of Riley county, south of Kimeo. West from this point 

 to Clifton the contact lies mostly in the northern row of town- 

 ships of Clay county. 



In the Republican valley the contact is concealed by a de- 



