REPORT OF THE DIRECTOR AND STATE GEOLOGIST 



only rough determinations, which however affect the value of the 

 record less than would be the case were the rocks in the well less 

 homogenous. 



The drill at present rests at 1350 feet, and no work has been 

 done for some months, though it may again be resumed. Some 

 20 feet of glacial deposit was passed through, and dolomite of 

 Calciferous age was struck just below the river level, near which 

 the well is located. Some 500 feet of Calciferous are shown in 

 the well, and between 500 and GOO feet, the alternating layers of 

 dolomite and sandstone marking the passage beds to the Pots- 

 dam, were met. The thickness of these could not be learned. 

 The remainder of the well is in the Potsdam, mostly of hard, 

 quartzose, white sandstone except for a considerable thickness of 

 red beds, encountered between 800 and 900 feet. At the time of 

 the writer's visit the well, at 1250 feet, was in resistant, white 

 Potsdam, little other than quartz showing in the sample. F. E. 

 Pierce of Morrisonville, one of the owners, writes me that the last 

 100 feet has been in precisely similar rock. This means that 

 fiom 750 to 800 feet of Potsdam has been passed through in the 

 well with no sign, as yet, of the arkose beds which always come 

 in as the base of the formation is approached. The record is as 

 follows: 



FEET 



Pleistocene 20 

 Calciferous 500 ±2 



Passage beds 50 ( ?) 

 Potsdam 775±2 



In all this great thickness of Potsdam sandstone only one stra- 

 tum was markedly water-bearing. A trifling amount of oil was 

 also found in one of the beds. 



Structural features 



Foliation. This structure is confined to the pre-Cambrian rocks 

 and was produced in them by deformation at a time when the 

 present surface rocks were so deeply buried as to be beneath the 

 level at which open fractures can exist. It is most prominent in 

 the gneisses of the Dannemora formation, less well marked and 



