264 J. D. Dana on the Quartzite, Limesione, etc., 
of the annexed section, fig. 13), there is an exhibition of quartz- 
ite under its various contradictory phases. In the first place, on 
the Monument Mountain side of the road, stands out in some 
Br as sae q “7 
1 
Section across Housatonic Valley and Monument Mountain. 
arts of their contour these masses might be taken for trans- 
ported boulders. ‘The dip of the layers of this soft quartzite is 
30° to 35° to the eastward, and the strike N. 5° to 20° E. 
At one place, 200 yards to the north of the other outcrops, 
this soft quartzite occurs on the west side of the road with the 
dip reversed or to the westward, the amount 15° to 20°, and 
with the strike N. 20° W.; and here also there are immense 
seemingly imbedded in the soft quartzite. Such a quartzite 
ment Mountain, and shows that all quartzite boulders else- 
where are not drift boulders. 
This soft, bedded, rotting quartzite at one place is exposed 
within forty feet of the massive enduring Monument Mountain 
quartzite, and with nearly the same dip, the latter not relenting 
in the slightest as it approaches the former. Are the two, not- 
withstanding the abrupt transition in texture, parts of the same 
layer? This is possible. Along the path descending northward 
from the eastern quartzite summit of Monument Mountain, the 
quartzite, elsewhere of extreme hardness, is for some yards thin 
bedded and rather fragile; showing a rapid falling off toward 
