99 



On turning to the Blooiuiugto-n quadvangle some very peculiar drainage 

 features will be seen. It will be noted tbat tbe headwaters of the western 

 branches of Clear creek southwest of Blooniiugton and the eastern tribu- 

 taries of Richland creek nearly west of Blooniiugton and north of Stan- 



Fig. 19. View of the same valley, as shown in Fig. 18, looldng in the same 

 diroction 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 creelv 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 of 

 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 soutli of Blanche. The water, after enter- 

 ing these sinks, appears in the deeply incised heads of Clear creek and 

 Richland creek instead of cuiitiuuiug down Indian creek. In otiier words, 

 Richland creek and Clciir creek iiave captured the waters of Indian creek 

 by subterranean piracy. 



