86 J. D. Dana on the Quartzite, Inmestone, etc., 
To the east of the quartzite the slopes (the eastern of ridge 
L) are covered with earth, showing that there is a soft, decom- 
posable rock beneath, probably mica schist ; and toward the foot 
of the slopes there is an outcrop of the mica schist, dipping 28° 
to the eastward, the strike being north. This amount of dip 1s 
very much less than that of the western side of the quartzite; 
and it is probable that the dip in the quartzite gradually diminishes 
to the eastward. The mica schist is evidently the stratum s* of 
Monument mountain, while the quartzite corresponds to g' and 
s'combined. The limestone of Lond Pond valley is 7’; while 
that in the quartzite is a layer not before noted, which we may 
call / ‘ 
The slate of the part of Tom Ball in this section is the 
smoothish mica slate, like that to the north, but it differs in 
earrying the high dip of 60°-70°, even down to its eastern 
foot. The strike is north or nearly so, like that of the lime 
stone and quartzite of the opposite side of Long Pond valley. 
On the western slope of the Tom Ball ridge the rocks are mostly 
concealed by earth ; but there are many exposures of limestone 
in Alford over the plain at its foot, and in these the beds have 
an average strike of N. 5°-10° E., and a dip of 50°-70° to 
the eastward ; in some places 90°. 
6. Continuing this section westward across the town of 
Alford, we pass from the limestone of eastern Alford to the 
mica slate of Alford ridge. The slate and limestone at their 
junction have the same strike and dip; the strike observ 
(just east of K on the map) being N. 7° E. and the dip 70° to 
the eastward. : 
In the western Alford valley there is again limestone with a high 
dip, and beyond this the mica slate of the Taconic ridge. The 
most western outcrop of limestone observed, or that nearest to 
the Taconic ridge, gave for the strike N. 19° E. and dip 52; 
and the same was obtained as the average for the slate of the 
ridge, a hundred yards distant. The limestone is evidently 
conformable to both the slate of Alford ridge and the Taconic. 
This slate in each is identical in its characters with that of the 
Tom Ball ridge—a smooth-surfaced mica slate, partly chlorite 
and more or less garnetiferous, and containing many qu 
veins the cavities of which are often filled with chlorite. : 
c. We come now to the question as to the folds along this 
section ; and, in connection, the character of the fold along the 
Tom Ball ridge elsewhere. 
At the north end of the Tom Ball ridge the existence of 4 
synclinal is fully demonstrated, as shown in fig. 5. The lime 
stone strata at the eastern and western foot here dip towa 
each other beneath the slates of the ridge; and moreover the 
limestone emerging on the east is directly continuous arou 
