Geology, &c. of the Connecticut. 7 
The highest point of the coal formation is Mount Toby 
in Sunderland, which “ee between eight and nine hundred 
feet above the Connecticut. Beginning at Whitmore’s fer- 
ry, the locality of the ichthyolites, to be hereafter described, 
and passing up the mountain obliquely to the south-east,we 
find alternations of most of the rocks described in the above 
jireer8 The differedt varieties of a are most 
ete being chiefly quartz, felspar and granite, and 
coal formation pudding-stone, being chiefly 
pres slate, — chlorite slate, talcose slate, and quartz 
with felspar and granite rarely. 4. The coal formation 
pudding stone often contains thin incrustations of ca 
nate of lime in on seams and crevices. The red sandstone 
is wanting in t 
As a general fact, I feel prepared to state that the oe 
of the coal formation lie above the old red sandstone. 
most cases these rocks are separated by greenstone, so that 
their exact situation cannot be easily ascertained. Along the 
western face of the greenstone ridge, extending from Mer- 
iden into Massachusetts, the rocks of the coal formation are 
ofa seen Cropping out below the greenstone ; and the old 
red sandstone occurs at a still lower level. is may be 
seen in the space of a few rods in descending the hill nor- 
therly, from Newgate prison ; and although the actual junc- 
tion of the rocks is not here observable, yet they appear . 
ct, that 
only at short distances from one another. The fac 
the coal formation alternates with greenstone, and thati 
latter rock always lies above the old red sandstone, is a 
strong presumptive argument that all the coal formation 
lies above the old red sandstone,and conclusive evidence that 
a part of these rocks lie above it. The situation of the rocks 
about Middletown, Chatham, &c. which might be urged 
as an objection to this fact, has been already considered, 
and I leave it for further examiuation. 
