26 



Report of the State Geologist. 



exposures at Hanawa Falls, where the rock is prevailingly red and massive, 

 the dip to the south-west has been resumed, and the horizon seems 

 much the same as at Clarkson's.* Still another mile to the south is Elliott's 

 quarry where the rock is light colored, being merely tinged with red. The 

 dip is still to the south-west though here it is quite low. 



One-fourth mile further south are most interesting exposures on both 

 .sides of the stream, at the site of an old mill. The west bank is formed of 

 Potsdam sandstone, here of white color and with a south-west dip. It must 

 lie higher than the rock at Elliott's quarry, and apparently is at a higher 

 horizon than any other seen south of Potsdam. The east bank of the stream, 

 which is here only a few rods wide, is composed of rotten pyritiferous, quartz- 

 •ose gneisses, much stained by hematite in their upper portion, which belong 

 to the Grenville series. The river just here is clearly occupying a fault line, 

 to the presence of which the disturbed character of the Potsdam is due. 

 Drillings for hematite ore not far east of the river, show apparent Potsdam 

 conglomerate overlying the Grenville rocks, so that the throw of the fault is 

 probably not excessively great. 



To the west of Potsdam is a great development of kame and drumlin- 

 like drift hills. The boundary indicated on the map merely connects the most 

 northerly Pre-cambrian outcrops seen, and in the absence of Potsdam outcrops 

 to the northward, must be regarded with considerable suspicion. The only 

 exposure seen was a meagre one at AVest Potsdam. 



The Calciferous Formation. 



No attempt to make a section of the Calciferous was undertaken. With 

 one exception all the outcrops seen were in close proximity to the Pots- 

 dam and merely represent the basal portion of the formation. The rock 

 exposed is a hard, iron-grey, often sandy dolomite, occasionally with nodules 

 -of coarsely crystalline calcite, and quite like the layers of dolomite in the 

 passage beds. 



In the Racquette river north of Norwood near the Norfolk-Potsdam 

 line, the rock exposed differs somewhat from the foregoing, being a quite 

 pure blue dolomite. One layer in particular is quite fossiliferous though the 

 fossils are not easily obtained in good condition. Quite a variety of forms are 

 present here, including species of Asaphm, Ortlioceras, Nautil us, Pleurotomaria 

 and a little Murchisonia which is identical with the species occurring in 

 the Ophileta beds at Beekmantown, Clinton county The locality is at the 



* Ibid. p. 104. 



