Geology, §c. of the Connecticut. 41 
and common granite, and. rarely gneiss or mica slate. The 
coloring matter of the rock, in most instances, has penc- 
— through these pebbles, giving the granitic nodules 
the same color as the rock, and the quartz a bluish as- 
rat ‘This conglomerate frequently. aligunates: with the 
sandstone, and one-half rin ae layer of a rock is sometimes 
sandstone, and th fissure. be 
ing between — ee ‘speaking, A en 
Pp nereases in quantity and-.coarenesssa8 ome 
ascend a aiaahaies of this rock, and al) the upper. ' 
the hill is sometimes composed of it. Probably morethan 
one half of the old aed ona: in n the northern ie 4 
mere variety of the 
“ek, 
Me 
ect fee ade. At least, there is one - ery. abai 
variety that is not found on the west side. It consists o 
fine, siliceous, red sand, adhering together with but vey 
little visible cement. It has, however, an argillaceous 
jour. The coherence is not as strong as in the coarser 
sandstone, it being slightly friable. This rock may be seen 
in picts in the southwest corner of Ludlow, and the east 
part of Long Meadow, Enfield, Somers, Ellington, re “4 
‘a herrodkf the rapitewatrh gues laeae 
other ne fami have ever seei 
oF aa t of this range of red eaneonnse0et of Connecti- 
| ry | towards the sandstone 
constitating the ¢ coal formation mples o y be 
xtens ive quarry in Shatin, and also in Mi i 
Teton eet seems to be a aR passage of - one 
rock into the other—and | the stra f both r 
have their ip i aes a. irs as Ff lead one, at "fists 
to conclude tha this old red ‘one lies | above the coal 
formation. The ipo both fos is ae east. At de 
2. 
aD 
eee 
I 
a 
ihe te tg god in ie repose on the other t ied 
‘Thus, let A B bea profile crossing the valley of the Connec- 
ticut, and exhibiting the strata of old red sandstone, having 
Vor. VI.—No. 1. : 6 
