al 
Consequences of the Glacial flood. 121 
the want of exposed sections. In a section of one near Pine 
Marsh Creek, made in laying out a new track for a railroad, 
r layer of the terrace formation, about 6 to 8 feet in 
thickness, followed down the steep slope of the depression con- 
formably to its surface ; but this single case is not sufficient for 
any general conclusion; it may have been due to a slide, 
though not looking like it. 
The kettle-holes are usually isolated; the coalescence of two 
or three in a single oblong or irregularly-shaped depression is 
alsocommon. They vary in diameter from 100 feet to more 
than 500 feet, and in depth from 16 feet to 50. The sides have 
the same slope as the terrace fronts along the river-channels, or 
generally 30° to 38°. They are often dry (if shallow), but 
generally are marshy at bottom, and not unfrequently contain 
a pond of water. : 
The distribution, sizes, forms, positions, and relations to the 
Beaver Pond and Pine Marsh depressions of the kettle-holes 
are so clearly exhibited on the accompanying map (Plate II) 
that detailed descriptions are not necessary. It is seen that 
the most of them range along parallel with these depressions. 
On the west side of the Beaver Pond depression the holes are 
partly in coalescing groups of two to four ranging parallel with 
the depression, or oblong in the same direction. On the east 
side are other oblong holes which are ¢ransverse in direction 
instead of parallel, yet still have an undoubted relation in posi- 
tion to the great depression. 
The cluster of kettle-holes near Augurville (see map, Plate 
It), at the junction of Sluice-way Brook with Mill River, is 
peculiar in its position. A map of the region on a larger scale (5 
Inches to the mile) is here introduced to show better their forms 
and their position in relation to the two streams. The map 1s 
from the Coast Survey chart and gives its contour lines. The 
<ettle-holes vary from small circular shallow bowls to large 
irregular depressions having a marsh at bottom which is 46 feet 
below the surface and on a level with the water in the river. 
As the contour-lines show, they do not connect directly with 
the Mill River Channel. ‘The contour line of 83 feet occurs” 
aaice-way waters, after passing the barrier of trap at the dam, ae 
Owed southward (as has been described) in a channel, s cae 
or 30 feet wide, worn by the waters out of the red 
