112 NEW YORK STATE MUSEUM 



Feet Inches 



8 Hard, vitreous, light colored sandstone, with 



darker calcareous sandstone above and below.. i 8 



7 Concealed to brook exposures next east; arbitrary 

 boundary between passage beds and Potsdam in 



the interval, about 30 



6 Light colored, vitreous sandstone, with alternating 

 layers of darker, calcareous sandstone which 



weather rapidly 30 



5 Light colored, vitreous sandstone 15 



4 Concealed 4 



3 Light colored, vitreous sandstone 2 



2 Concealed 4 



I Conglomerate, increasing in coarseness downward, 



and reaching nearly to the base of the formation. 10 



In this section we find then a thickness of 94 feet, i inch of the 

 Hoyt limestone member of the Little Falls formation, counting 

 in with it the 20 foot gap between it and the passage beds, with 

 the summit of the member not reached ; beneath it a thickness of 

 52 feet, I inch of what we class as passage beds, counting in with 

 them the 30 foot gap between them and the Potsdam ; and finally 

 96 feet, 8 inches of Potsdam with the base not reached, though 

 it is unlikely that as much as 10 feet lies beneath. We find es- 

 sentially the same trilobite fauna ranging through a thickness of 

 at least lOo feet, commencing in the passage beds and continuing 

 up through the entire thickness of the Hoyt limestone. There is a 

 measured thickness of 119 feet of Little Falls dolomite above the 

 Hoyt member in the Highland Park section which shows neither 

 the base nor the summit. We are, however, disposed to think that 

 the entire thickness of this part of the form.ation is not greatly 

 in excess of this, and that the coarsely crystalline, light colored 

 dolomite of the upper part of the Highland Park section consti- 

 tutes the summit of the formation about Saratoga. In the north- 

 ern part of the village just south of the quarry which furnished' 

 the top of our measured section and close to the fault are a few 

 thin patches of Mohawkian limestone, resting upon these upper 

 beds and apparently directly deposited upon them. The Mohawkian 

 is a conglomerate with many pebbles of the underlying dolomite. 

 The horizon of this contact is certainly not more than 20 feet above 

 the top of the quarry section. 



