May, 1908.] Stream Diversion near Lakeville, Ohio, 
35 r 
I want to examine it as to fact and nature of evidence, and thus 
discover the cause, treating it as illustrating a method of re¬ 
search rather than as telling of a new kind of phenomenon. 
The region is that of the head waters of the Mohican, a stream 
which unites with Owl Creek to form the Walhonding, which 
in turn unites with Killbuck Creek and enters the Tuscarawas 
at Coshocton. The critical places in the case are in southern 
Ashland County and western Holmes County. 
The Mohican Creek proper is made up of the waters of sev¬ 
eral smaller creeks, Muddy or Lake Fork from the northeast 
which also brings the waters of Jerome Fork, Black Fork from 
the nothwest, and Clear Fork from the west, which joins Black 
Fork just above the narrows at Uncas and Spellacy. 
Black Fork comes down from north of Mansfield in a post¬ 
glacial valley hitting the rocks occasionally and then leaping 
over falls and rapids or winding through gorges. Fleming’s 
falls and gorge above Miflin furnish a good example of this habit. 
But just before entering Ashland County above Perrvsville, 
Black Fork enters a broad, mature, rock valley, more or less 
plugged with moraine of Wisconsin age and pursues it to Lou¬ 
don ville. Here it abruptly turns into the south wall of the big 
valley and winds through a six or seven mile gorge into Knox 
County, where it joins the Muddy Fork and the two constitute 
the Mohican. 
In like manner Jerome Fork heads in post-glacial valleys in 
the drift of northeastern Ashland County, but before joining 
Muddy Fork at the town of Lakefork it finds itself in a broad, 
open, mature, rock valley leading southeast. At Lakefork, 
having entered Muddy Fork, its waters turn abruptly into the 
hills and lead southward into a rapidly narrowing valley. The 
narrowest part is found about midway between Lakefork and 
Lakeville where the stream seems to have cut a notch in a low 
mature divide. Below this place, the valley widens southward 
and emerges into the very broad mature valley, which Black 
Fork followed seven or eight miles; and the stream, turning 
westward in the large valley, winds about among morainic hills 
for some two miles, then turns again into a hill-enclosed nar¬ 
rowing valley" and follows it southward through two morainic 
loops, and on southward to the Mohican, which is said to flow 
through a narrow valley’ in a very’ hilly country^. The author 
has not seen this portion of the Mohican. 
A sluggish little branch of Muddy r Fork rising among a series 
of morainic loops northeast of Big Prairie flows through a broad 
clay-bottomed, level-floored valley’ for five or six miles and en¬ 
ters the Muddy just before the latter goes into the hills at Lake- 
fork. 
