CLASSIFICATION OF SPRINGS 



SS7 



has been explored for more than a mile.^ Certain cold springs on 

 Mount Shasta, however, appear to be due to the melting of buried 

 ice.^ 



Minor tubular springs are due to a variety of causes (Fig. 216). 

 The tubes or channels are of small size and irregular length, and 

 many of them appear to be due, at least in part, to the movement 



Inclined fracture springs 



Fig. 22. — Diagram illustrating three classes of fracture springs: a, quadrille 

 fracture springs; h, Crosshatch fracture springs; c, inclined fracture springs. 



of the water itself. Unconsolidated deposits are particularly sus- 

 ceptible to this action. The decay of plant roots, the existence of 

 small sand streaks, and the enlargements of shrinkage cracks may 

 all assist in the production of these minor openings. 



2. Fracture springs. — Springs that issue from sheetlike or plate- 

 like openings in non-porous rocks may be called fracture springs, 

 because such openings are primarily due to fractures. Joints, 



'H. W. Fairbanks, Practical Physiography (Boston, 1906), p. 178, Fig. 180. 

 ^ G. A. Waring, op. cit., p. 332. 



