64 XEW YORK Sr.-rz MUSEUM 



glomeiate but also in the absence of tbe deep red, hemaddc arkose 

 sandstones so abundant in the basal portion of the Potsdam in 

 Clinton count}- and on the north border of the Adirondacks. Alto- 

 gether the sandstone of this area resembles in its physical characters 

 more the middle and upper divisions of the Potsdam as distin- 

 guished in the typical sections at Keese\-ille and Potsdam by \'an 

 Ingen and Gushing, than it does the lower portion. It is best ex- 

 posed at Port Henry in Bond's quany- above the ^^lineville railroad 

 track and in the cut of the Delaware and Hudson Railroad north 

 of the station. In the former place, as also along the upper }^Ic- 

 Kenzie brook, \siiite and yellowish fine grained, partly hea\y bedded 

 and partly slabby sandstones with occasional shMy bands prevaiL 

 By universal cross bedding, floating large sand grains. ri|^le- 

 marked surfaces (beautifully displayed along McKenzie brook) 

 and intercalations of brecdated beds it is indicated that these 

 sandstones which would seem to correspond to the middle portion 

 of the Potsdam^ were deposited not far from the shore line. In 

 the railroad cut about 60 feet of whitish gra}' sandstone in one- 

 foot courses are exposed that present the typical and usual appear- 

 ance of the Potsdam sandstone. These beds are within a third of 

 a mile of the exposure of the Beekmantown beds at the tunnel and 

 since they dip in that direction, the interval of drift-filled vaUey is 

 inferred to be eroded in the remainder of the Potsdam series. 



The isolated expc^ure of Potsdam beds in ^le fault block at the 

 south end of the Wes^rt Paleozoic area is again conqmsed of 

 evenly bedded brownish, yellow and white sandstones corresponding^ 

 to the higher portions of the formation. About 100 feet of these 

 are exposed in the railroad cut. TTie third exposure of Potedam 

 sandstone in the portion of the quadrangle here discussed is in the 

 \-il!age of Wes^xjrt above the highway bridge and along the diore. 

 Only about 35 feet consisting of whitish sandstone in one-loot be^s 

 followed farther up by heavier beds of brown sandstone, are 

 exposed- 

 While the evidence on the development of the Potsdam forma- 

 tion in the area under discussion, owing to its faulted and mudi 

 eroded ccMidition is very incomplete and time was lacking for a 

 more exhaustive investigation of the formation, it seems fairiy 

 certain that the lower Potsdam, and probably also the upper Pots- 



lection, 1. e. c 



