409 



main channel near the northern middle of Section 36. The bed-rock outcrop 

 along McCormicks Creek in the southeast part of Section 26 indicates that 

 the region to the northeast was high, very probably a divide between the 

 tributary just mentioned and the one that undoubtedly came from the 

 northeast of section 24. Wells Nos. 10, 11 and 12, by their depth to bed- 

 rock, reveal a channel region running south and southwest from section 

 23, from near where McCormicks Creek leaves the Flatwoods region. A 

 A small tributary in bed-rock flowing its water in the up-stream direction, 

 just west of where McCormicks Creek turns west in section 23, also indi- 

 cates that a channel once went southwest from this region. There is no 

 doubt in the mind of the writer that this region and also the long ex- 

 tension north into section 24, was drained to the west and north through 

 a well developed underground system. Well No. 14 shows that the 

 ancient surface was more than 116 feet below the present surface, and 

 more than eighty-five feet below the bed of McCormicks Creek a mile to 

 the north. At this place the old stream channel must not have been far 

 from the 600 foot contour line. 



The western border of Flatwoods in the region of the headwaters of 

 Allistons Branch reveals facts in harmony with those shown by the wells. 

 The tributaries of this creek are etching their way slowly into the Flat- 

 woods region. The etching is slow because the slope is away from them, 

 thereby causing practically all the water, except that which falls immedi- 

 ately into them, to flow in the opposite direction. These tributaries are 

 deep, Y-shaped valleys or ravines in the sandy material at this margin of 

 the region. A typical ravine may be found just south of the middle of 

 section 27. It begins at an elevation of 760 feet, and descends rapidly to a 

 depth of sixty feet or more. The sandy banks on either side are very 

 steep. Small erratic boulders may be found in the narrow bottom, amid 

 which trickles water seeping from the sandy banks near the bottom. The 

 descent continues rapidly until near the 620 foot contour. A small 

 valley flat then begins to appear, and soon the main stream is reached. 

 The entire length of this ravine is less than one-fourth mile, and a 

 descent of at least 150 feet has been made. The slope away from the 

 Flatwoods region towards White River, much cut up by etching ravines, is 

 very rapid ; this makes the banks or sides of the etching ravines higher 

 near their heads than farther down. 



The great amount of sandy material at the head waters of Allistons 

 Branch indicates that the old channel found and traced westward by the 



