452 NEW YORK STATE MUSEUM 
It Mostly covered. Highly inclined layers of 
sandstone exposed in the creek banks 120 feet 
above no. 20. 120/== 3090" 
I22 Covered to top of hill but with an occasional 
exposure of sandstone. 680 feet by barometer. 680’—=1070" 
In this section the shales are in general disposed in very thin 
irregular laminae so that they weather quickly to small angular 
sharp edged fragments. The joint structure of both sandstone and 
shale is well shown in almost every part of the section and specially 
at no. 20 where there is a vertical wall of 39 feet of sandstones and 
about Io feet of shale. At the base of the section the dip is about 
78 feet a mile to the south, but a little farther up stream it is 
reversed and a short distance farther up is again reversed and from 
thence is in general southerly and quite pronounced. It will be 
seen that the shale predominates in the lower half of the 270 feet 
of continuous exposures and sandstone in the upper half. In the 
first 160 feet there are 85 feet of shale and 75 feet of sandstones 
while in the remainder of the 270 feet there are 31 feet of shale and 
79 feet of sandstone so that the total 116 feet of shale and 154 feet 
of sandstone shows that on the whole the sandstone predominates. 
Furthermore the higher in the section the more arenaceous are the 
shales themselves. The base of this section is probably not far_ 
above the top of the Utica stage. For less than two miles east 
of this locality about 200 feet of shales, graptolitic in the lower 
part, are exposed in a ravine a short distance west of the new 
Schenectady waterworks, which shales are probably the same pas- 
sage bed noticed in the Minaville section (q. v.) The section also 
indicates that at least 1160 feet (from the elevations of the topo- 
graphic sheet) of the Hudson river stage are present at this locality. 
Descending the west side of Waterstreet hill into the valley of 
the Sandseakill, thin bedded sandstones with scarcely any shale 
are passed over till the bed of the creek is reached at the point 
where the road running on the eastern and northern slopes of 
Princetown hill crosses the creek. Here occurs an outcrop of 
blackish graptolitic shales, again closely resembling the passage 
bed of the Minaville section, and dipping strongly down stream 
and westerly. This exposure extends down the Sandseakill for a 
short distance when the creek bed becomes filled with debris largely 
