[Assembly 
These shales form the elevated parts of Lewis county, a considerable 
portion of the northwest part of Oneida, and the comparative depres- 
sion which extends from Pulaski to near Jefferson county, bordering on 
the Lake. Their most southern point is at Talcott's quarry, about two 
miles southeast of Rome. 
Salmon River sandstone. This rock is grey and greenish as to co- 
lour, the latter prevailing at the lower part, the former at the upper. 
Frequently there is a thin coating of green shale upon the lower layers, 
with and without markings or configurations like fucoides. 
This rock forms the falls of Salmon river, in the town of Orwell, 
and the falls on the same river above Redfield village, and though their 
elevation be very different, yet they were originally parallel masses. It 
forms the knobs near Florence village, and the rock of Woodruff's quar- 
ry, to the southeast of Rome. It may be seen to the north of the road 
which leads from Pulaski to Oswego, where we have the upper part. 
From the falls at Orwell it disappears, descending the river so as to 
bring the shales of Pulaski in view. This rock furnishes grind stones, 
near the High falls of Salmon river, and at Woodruff's quarry, as men- 
tioned in former reports. 
Medina sandstone. Called in former reports the red sandstone of 
Oswego. Predominant colour red, more rarely whitish and greenish. 
This rock is confined to Oswego county, to the high grounds of Oneida 
at Florence village, and other parts of the town of Florence, and to the 
extreme north parts of the counties of Onondaga and Cayuga. 
In this rock are many brine springs, and it is the lowest deposit of 
western New-York for common salt. 
Its characteristic fossil is Fucoides Harlanii, being abundant at the 
upper part of it, and exclusively confined to this rock. 
Oneida conglomerate. The "millstone grit" of Prof. Eaton, which 
has been changed, to do away with all ambiguity, there being no other 
rock of the kind in Oneida county, if we except the thin irregular lay- 
ers, composed of small sized pebbles, which makes a part of the suc- 
ceeding group, and which may be seen at Blackstone's quarry, to the 
south of Utica. 
Protean group. This group by the next report will be divided into 
two, the upper one consisting of the Lockport limestone and its calca. 
