124 PHYSICAL GEOLOGY 



below the level of the bottom of the largest valley of the region ? 

 (See Fig. 110.) 



6. In parts of eastern Tennessee sinks occur in belts that are 

 rudely parallel to one another. What facts may be inferred from 

 this concerning (1) the character, and (2) the structure, of the rocks ? 



7. What inferences may be made from the fact that on a given 

 valley side strong springs occur at intervals along a line that rises 

 down valley ? 



8. What facts concerning ground water are illustrated by Figure 

 115? What inferences may be made concerning the rocks? 



9. What inferences concerning ground water may be made from 

 the fact that at many points in the ocean near shore, strong fresh- 

 water springs well up ? 



REFERENCES 



BLATCHLEY : Indiana Caves and Their Fauna, in 21st Ann. Kept., 



Ind. Geol. Surv., pp. 121-212. 

 CHAMBERLIN : Artesian Wells, in Geology of Wisconsin, Vol. I, pp. 



689-701. 



Requisite and Qualifying Conditions of Artesian Wells, in 5th 

 Ann. Kept., U.S. Geol. Surv., pp. 131-173. 



CHITTENDEN : The Yellowstone National Park. (Cincinnati, 1895.) 

 GEIKIE, J. : Land Forms Modified by the Action of Underground 



Water, in Earth Sculpture, pp. 266-277. (New York, 1898.) 

 HOVEY : Celebrated American Caverns. (Cincinnati, 1896.) 

 HOVEY and CALL : The Mammoth Cave of Kentucky. (Louisville, 



1897.) 

 MERRILL : The Principles of Rock Weathering, in Jour, of Geol., 



Vol. IV, pp. 704-724, 850-871. 



Rocks, Rock Weathering, and Soils. (New York, 1897.) 

 SHALER : Caverns and Cavern Life, in Aspects of the Earth, pp. 98- 



142. (New York, 1889.) 



