222 
Harmon A. Nixon and Dexter J. Tight 
is due to a differential tilting during the late Cretaceous, or Plio- 
cene period, which was characterized by such movements. This 
can safely be correlated with the movement to which Scheffel 
refers, we think, because they were both locally confined, the tilts 
were in the same direction, and both took place at about the same 
time. 
As a result of these and similar investigations in the state, there 
is a tendency among students to take the view that glaciation has 
not been the important factor in the diversion of streams and 
alteration of drainage systems which it was considered a few 
years ago. However, in all probability, the change of drainage 
which we describe in the present paper was due primarily to 
glaciation. 
Drainage Changes in the Moot’s Run Area 
Detailed description of Moods Run and its tributaries. The 
problem which forms the subject of this discussion is connected 
with the upper course of Aloot’s Run. This stream lies in St. 
Albans Township, flowing, throughout most of its course, parallel 
to the Raccoon and in the same direction. This portion of the 
stream is about two miles directly south of Alexandria. At 
Parry’s, a half mile west of the Gaffield School, ^Hhe stream turns 
directly north, and thence flows in a fairly straight course to the 
Raccoon. 
Certain phenomena noted in the course of this stream suggest 
that it is not such a one as would be developed in an age of normal 
erosion. These phenomena are: 
1. Just south and west of Parry’s a valley three-eighths of a 
mile in width suddenly narrows to a rock gorge 240 feet in width, 
a condition not found in normal erosion in a region of homogeneous 
rock texture and structure. 
2. A repetition of the above phenomenon at the source of the 
second tributary of Aloot’s Run. 
3. The axes of Moot’s Run and the main portion of the second 
tributary are parallel to the axis of the drainage divide on the 
south; thus Moot’s Run and its second tributary flow parallel 
to the divide instead of away from it. 
12 All of these points may be located at once by referring to the accompanying 
topographic map. 
