58 



then again turn from one another until, in the western part of Lawrence 

 and Martin counties, they come nearer and at the southwestern corner of 

 Daviess County are united in one sti'eam at an elevation of about 425 feet. 

 Both forks are fed by niunerous tributaries, which produce an intricate 

 drainage system. In many places the heads of these tributaries approach 

 each other very closely and have in some cases resorted to piracy. It is ob- 

 vious from the varying character of the valleys and the terraces which bor- 

 der them, that both forks suffered many disturbances during the glacial 

 period. As lias been stated, we kiu)\\' that valle.ys have been excavated by the 

 streams flowing through them, and it is also true that the terraces beauti- 

 fying their sides are in most cases due to the same agencies — that is, ter- 

 races owe their origin to the processes of corrosion, or of deposition, or to 

 both. Many of the terraces are due principally to the re-excavation of pfe- 

 glacial valleys. In much of the uuglaciated area there are marks of sev- 

 eral well-defined drainage levels. The region ranges in elevation from 150 

 to 300 feet ; the streams cut down rapidly from the upland, then run off 

 with a slight gradient through deep valleys with rather flat and compara- 

 tively wide bottoms and very steep sides, with stepped and sloping terraces 

 with gracefully bending curves which add much to the attractiveness of the 

 valleys. The upper terraces are formed by the streams cutting down through 

 the formations of the original table-lands. The lower terraces are com- 

 posed of mixed materials of the higher levels. The best examples of these 

 terraces are in the Salt Creek and (^lear Creek valleys, and in the prin- 

 cipal valley of the main East Fork and its adjacent side valleys. Some 

 of these terraces are shown in the illustrations. 



This entire drainage area affords much for Interesting study and ex- 

 ploration, but, as stated above, it is in the uuglaciated portion that is 

 found the most picturesque scenery. The diversified physical features pro- 

 duced by the processes of erosion and the weathering of the various geo- 

 logical formations give a region of rugged and beautiful scenery. Some 

 of the characteristic and marked scenic points are described below. 



"Weed Patch Hill," in Brown County, is a high ridge in the Knob- 

 stone, forming the divide between two of the main branches of Salt Creek. 

 At its highest point it is a little more than 1,000 feet in elevation. One of 

 the illustrations gives a view looking northwest from this elevation and 

 gives an idea of the Knob topography. "Guinea Hills" is a ridge rising to 

 a considerable elevation, extending in a northeast and southwest direction 

 through the southwest part of Scott and the northwest part of Clark coun- 



