400 hs Jake (OCME IWS. 
the southwest without very great deflection. The bottoms of 
the deeper valleys in the interior not only show no striz, but 
very little smoothing and polishing, while preglacial fault cliffs 
stand out perfectly sharply, with scarcely a sign of corrasion. The 
summits however have been markedly smoothed; the abundant 
bowlders of Potsdam sandstone on even the highest peaks give 
unquestionable evidence that the region was entirely buried, and 
by ice in vigorous motion. The conclusion reached is, therefore, 
that the ice entered the region from the northeast, flowing on in 
that direction where open valleys afforded opportunity, becoming 
stagnant in narrow valleys, and finally at the time of its greatest 
advance burying the region entirely, an upper southwestward 
moving current passing over the stagnant valley masses below. 
The accompanying table enumerates all the stria that have 
been accurately recorded from the region. In the literature 
there are many references of an indefinite nature, speaking of 
striz in general northeasterly directions. These were of neces- 
sity omitted from the table and map, but the references to them 
indicate that strize are more numerousthan is shown on the map. 
Not a single record has been found among the highest mountains. 
The map shows the three zones of striation: a zone along the 
Champlain valley where striae are very numerous and variable 
in direction; a zone along the gneissic hills where they are less 
numerous and prevailingly northeast; and a zone among the 
high anorthosite peaks, where striz are entirely lacking, though 
the mountain tops here are conspicuously smooth. The readings 
taken by Professor Kemp along Lake Champlain and Lake 
George are so numerous that they could not all be put upon the 
map, hence the contrast is even more striking than it appears. 
Farther north along Lake Champlain strie appear to be as numer- 
ous as inthe southern region, but accurate records have not been 
taken in many localities. All readings are referred to the true 
north ; each striation is credited to its observer in the right hand 
column of the table. In Vermont and the Islands in Lake 
Champlain the striz on the map are taken from Hitchcock." 
1 Geology of Vermont, Vol. I. 
