45^ NEW YORK STATE MUSEUM 



I^i Mostly covered. Highly inclined layers of 

 sandstone exposed in the creek banks 120 feet 

 above no. 20. 120'= 39^' 



p2 Covered to top of hill but with an occasional 

 exposure of sandstone. 680 feet by barometer. 68o'=i07o' 



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 10 feet of shale. At the base of the section the dip is about 

 yS 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 locaHty 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 11 60 feet (from the elevations of the topo- 

 graphic sheet) of the Hudson river stage are present at this locaHty. 

 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 



