174 J. F. NEWSOM 
(with which is included the lower course of the Muscatatuck), 
the drainage lines of the central area are evidently controlled by 
the geological structure of the country. The effect of the struc- 
ture upon these streams is well shown in the case of Ramsey 
Greek 
a tributary of the Muscatatuck—which rises just west of 
Madison near the northeast corner of township 3 north, 9 east, 
within one and one-half miles of the Ohio River, and 360 feet 
above that stream. The waters of Ramsey Creek flow into the 
Muscatatuck, then through East and West White rivers, and the 
lower Wabash, and finally empty into the Ohio at the extreme 
southwestern corner of the state, a direct distance of 170 miles 
from the source which was within one and one-half miles of the 
Ohio. 
From Edinburg to Rockford, a distance of twenty-seven 
miles, East White River flows southward, parallel to the Knob- 
stone hills and but a few miles east of them. Its tributaries from 
the west are short and have steep gradients. Those from the 
east and northeast are long. They rise at the watershed formed 
by the Niagara strata and flow with the dip down the south- 
westward slope of the country. The sources of some of the 
eastern tributaries of East White River are but a few miles west 
of the Whitewater River—the main drainage stream of the east- 
ern area. The asymmetry of the area drained by East White 
River is shown by the accompanying drainage map (Plate VI). 
One of the most interesting features of the drainage of the 
central area is the course of East White River below Rocktord 
(C, Plate VI). From Edinburg to Rockford this stream flows 
south along the bottom of the trough east of the Knobstone 
hills. But while this trough extends on southward to the 
Ohio River and is apparently the line along which White River 
could have most easily developed its course, that stream, instead 
of following the valley (4, C, 8, Plate VI) to the Ohio, turns to the 
west at Rockford and flows through broad bottom lands until it 
is joined by the Muscatatuck, at the south side of Jackson county. 
Just below the mouth of the Muscatatuck it enters a compara- 
tively narrow valley, which has been cut down through the Knob- 
