224 
Harmon A. Nixon and Dexter J. Tight 
age would result in such a case? This question Scheffel has 
answered in the paper referred to above. By a differential move- 
ment of the rock a new divide was formed east of Alexandria. 
This resulted in a reversal of drainage, and we have the anomalous 
condition of a stream, with a wide mature valley at its headwaters, 
flowing eastward through a narrow, constricted channel at Gran- 
ville. 
One might immediately infer that this is the exact condition 
which we have in Moot’s Run area. Is the reversal of drainage 
not due to the same diastrophic cause? We would give a negative 
answer, for several reasons: 
1 . If Moot’s Run had been a normal tributary to the old Alexan- 
dria River, joining it in the vicinity of Alexandria, and this tilt 
had taken place, it would not have been sufficient to cause Moot’s 
Run to adopt a course parallel to the Raccoon, and with the same 
direction of flow. 
2. There are, however, very substantial reasons why this di- 
version of Moot’s Run cannot be correlated with the diastrophic 
movement that produced the narrow section of the Raccoon Val- 
ley at Granville. An examination of the well records at the houses 
along the road just to the north and parallel to Moot’s Run 
shows a slope of the rock floor to the west for over a mile. These 
records are as follows: At the temporary bench mark, one-half 
mile south of the Gaffield School, the bed rock surface is 1125 
feet above sea level; at T. Carrol’s^^ it is 1065 feet above sea 
level; at W. Carrol’s its altitude is 1075 feet. It is evident, from 
a comparison of these heights above sea level, that the rock sur- 
face slopes slightly to the west, and has done so ever since pre- 
Pleistocene times. Hence the diastrophic movement to which 
Scheffel refers was not sufficient to divert Moot’s Run into its 
present channel. 
3. A proof, sufficient in itself to controvert the theory of dias- 
trophism as applied to this area, is the fact that Moot’s Run at the 
present time cuts across thick beds of glacial drift in situ, showing 
clearly that this stream has adopted its present course since the 
glacial period, or, at the earliest, at some late interglacial time. 
Since the diastrophic movement referred to took place before 
Pleistocene times, probably during the late Cretaceous or Pliocene 
For location of wells see accompanying topographic map. 
