54^ 



KIRK BRYAN 



near Corning, California, in places where the soil above the hardpan 

 is thick and continuous enough to form a reservoir, are permanent. 

 2. Springs at the outcrop of an inclined surface. — If the under- 

 lying impervious bed has a regular but inclined surface, all the 



'^0+^"V-'4' ■'■%^ .Spring horizon 



■ -'■ J.-V- -y-V V- Ni^ \\ f__ .^Irrigated lands 



■Material of landslides 



Fig. 8. — Diagram illustrating the conditions producing springs on the east flank 

 of Chuska Mountain, New Mexico. (From Gregory.) 



C. Inclined hardpan spring 



Fig. 9- — Diagram illustrating three classes of contact springs with underlying 

 bed regular and inclined: a, inclined gravity springs; h, cuesta springs; c, inchned 

 hardpan springs. 



springs will occur at the outcrop of the contact on the low side, 

 unless the overlying bed is very thick and the dip of the rocks slight. 

 In general, where the underlying bed is of large extent, these 

 conditions exist in sedimentary rocks. Springs of this kind are 



