aera 
+ At 
c. 
Los 
. 
56 Transactions of the Academy of Science of St. Lowis 
ments were made directly up and down the slopes, and the 
traverses were divided into the three categories given above. The 
percentage in each category was then calculated. 
4. The values obtained for the traverses were applied to 
the areas they crossed, and the percentages were recorded on 
the areas outlined on the map. 
5. Boundaries and data for percentages of land in slopes 
exceeding 5 per cent and for those exceeding 14 per cent were 
transferred to 1:1,000,000 base maps. No map was made for the 
percentage of land in slopes 5 per cent and less, as these values 
can readily be determined from the map of slopes exceeding 5 
per cent. 
6. In parts of the area for which there were no topographic 
maps, numerous field measurements were made with clinometer 
and aneroid barometer. 
‘The White River Hills Region2°, which, illustrates the appli- 
cation of the above methods, is one of high steep-sided hills carved 
from strata of high differential resistance by the White and 
James rivers. On the south the region is bounded by the Eureka 
Springs Escarpment and by the north front of the Boston 
“Mountains”. On the northwest the Burlington Escarpment and 
the continuous cap of Burlington-Boone limestone beyond it mark 
the line. The north-eastern limit is arbitrary, being based upon 
decreasing ruggedness. The White River Hills include the 
Burlington-Boone Cap and parts of the Jefferson City-Cotter 
and St. Peter-Kinderhook geologic regions?!. 
Hills on which the protective caps of Burlington-Boone clhiert 
and limestone remain are flat-topped and butte-like, whereas the 
lower hills of Jefferson City-Cotter dolomite from which the caps 
20. Figure 6. 
21. Figure 5. 
