THE WORK OF GROUND WATER 79 



tallization until a hollow sphere, many times larger than the original 

 fossil, may result, lined with crystals. In some geodes of this sort 

 the fragments of the fossil may be entirely dissolved away. 



REFERENCES FOR UNDERGROUND WATER 



Springs 



Bowman, I., — Forest Physiography, pp. 41-61. 



De Martonne, E., — Geographie Physique, pp. 342-347. 



Fuller, M. L., — Occurrence of Underground Waters: Water-Supply Paper, U.S. 



Geol. Surv. No. 114, 1905, pp. 18-40. 

 Gregory, H. E., — Underground Water Resources of Connecticut : Water-Supply 



Paper, U. S. Geol. Surv. No. 232, 1909, pp. 60-76. 

 Slichter, C. S., — The Motions of Underground Water: Water-Supply Paper, U. S. 



Geol. Surv. No. 67, 1902. 

 Weed, W. H., — Formation of Travertine and Siliceous Sinter by Vegetation of Hot 



Springs: Ninth Ann. Rept., U. S. Geol. Surv., 1889, pp. 613-676. 

 Woodward, H. B., — The Geology of Water Supply, pp. 79-95. 



Artesian Wells 



Chamberlin, T. C, — Artesian Wells: Geology of Wisconsin, Vol. I, 1883, pp. 689- 



701. 

 Chamberlin, T. C, — The Requisite and Qualifying Conditions of Artesian Wells: 



Fifth Ann. Rept., U. S. Geol. Surv., 1885, pp. 125-173. 

 Da.rton, N. FL, — Geology and Underground Water Resources of the Central Great Plains: 



Professional Paper No. 32, U. S. Geol. Surv., 1905, pp. 190-372. 



Karst 



De Martonne, E., — Geographie Physique, pp. 462-472. 



Geikie, J., — Earth Sculpture, pp. 266-277. 



Katzer, F., — Karst und Karsthydrographie, 1909. 



Knebel, W. V., — Hohlenkunde mit Berucksichtigung der Karstphdnomene, 1906. 



Caves 



Blatchley, W. S., — Indiana Caves and their Fauna: Twenty-first Ann. Rept., 



Ind. Geol. Surv., 1897, pp. 121-212. 

 Hovey, H. C, — Celebrated American Caverns. 

 Martel, E. A., — Les Abimes. 

 Matson, G. C, — Water Resources of the Blue Grass Region: Water-Supply Paper, 



U. S. Geol. Surv. No. 233, 1909. 

 Shaler, N. S., — Aspects of the Earth, pp. 98-142. 



Concretions and Geodes 



Arnold, R., — Dome Structure in Conglomerate: Jour. Geol., Vol. 15, 1907, pp. 560- 



57o. 

 Geikie, J., — Structural and Field Geology, pp. 120-124. 

 cleland geol. — 6 



