gS 
On turning to the Blocmingten quadrangle sonte very peculiar drainage 
features will be seen. It will be noted that the headwaters of the western 
branches of Clear creek southwest of Bloomington and the eastern tribu- 
taries of Richland creek nearly west of Bloomington and north of Stan- 
Fig. 19. View of the same vailey, as shown in Fig. 18, looking in the same 
direction above the cascade, showing the old, wide valley with indistinct retreating 
sides. Were this valley developed in soluble limestones it is easy to see how the 
water might enter the ground above the cascade and appear as springs below it. 
ford Station frequently lie in deep valleys with steep heads. On the plain 
between these two creeks is a region which is drained by great sinks oppo- 
site the heads of these streams. <A little farther south Indian creek heads 
on this plain and continues a little west of south with gentle grade in its 
headwaters compared with the ones before mentioned. By following the 
valley at the head of Indian creek northward it will be discovered that the 
valley extends as far north as the race track west of the northern part or 
Bloomington, and that the water entering the large sinks just mentioned 
is really the water of the head of Indian creek. The same will be noted 
of the great sinks northeast and south of Blanche. The water, after enter- 
ing these sinks, appears in the deeply incised heads of Clear creek and 
Richland creek instead of continuing down Indian creek. In other words, 
Richland creek and Clesr creek have captured the waters of Indian creek 
by subterranean piracy. 
