Subterranean Phenomena 209 
tically at stream level, for a distance of 100 yards or more. There is 
nothing spectacular about either the “sink” or “rise”. In high water the 
surplus passes through the surface channel around the great meander 
curve. le 
One may speculate on the drainage conditions here in the future. 
It does not appear that the subterranean route is likely to become 
clogged and the route shut off. The St. Louis limestone is notable 
throughout its outcrop in Indiana and Kentucky for its perfection of 
FIG. 5. 
Fig. 5. View of the meander curve against which Indian Creek channel snugly fits 
just northeast of the center of section 8. (See Fig. 1.) The view shows the main 
part of the spur forming the neck between the two limbs of the great meander curve. 
It is locally known as “‘Boogers Point’. The arrow indicates the place of the re- 
entrance of Indian Creek waters into the surface channel. (See Fig. 4.) 
development of subterranean channels. Lost River in Orange County, 
Indiana, has a subterranean route 8 miles in length, having practically 
abandoned a surface route approximately 19 miles in length. It is 
possible and even probable that the subterranean route will be enlarged 
in the future. One may consider it as developing to the stage of an 
open tunnel and the formation of a natural bridge. The rock of the 
ridge over the subterranean route is at least 200 feet thick and is com- 
petent. The lower 150 feet of it is limestone and the remainder is 
sandstone. If it should ever reach the open tunnel stage, it is only a 
step further to the open drainage stage. Such a condition is a high 
probability in the course of time. Each end of the subterranean route 
is situated on the outside of a meander curve. These curves may be 
expected in time to develop, and the subterranean route thus become 
shorter. Such will only hasten the development of the passage way to 
the open tunnel stage and eventually to the open drainage stage. When 
it has advanced to either one of these stages the present circuitous 
meander channel may be abandoned. If this condition is ever attained 
the meander route would no longer be considered a part of Indian Creek 
14-20320 
