242 NEW YORK STATE MUSEUM 



Cobleskill Feet Inches 



d 1 to d 3 Cobleskill limestone in several beds, not 



well exposed 6 



Brayman 



c Brayman shales, the higher beds exposed 

 on the roadway leading up to the quarry, 

 the lower in contact with the basal sand- 

 stones shown below the crusher — on rail- 

 road track. Thickness as measured by 

 Hartnagel 27 



Binnewater 



b Basal sandstones, a quartz sandstone of 



yellowish and reddish color, consists 

 generally of almost pure quartz grains 

 though some beds are slightly argilla- 

 ceous. Lower beds thin, the upper thick 

 bedded but saccharoidal and containing 

 much pyrite like the overlying shales. 



Thickness estimated 20 



Stratigraphic unconformity. 



Lorraine 



a Lorraine sandstones ( ?) dark grayish or 



purplish silicious sandrock resembling 

 the normal Hudson river sandrock of 

 the Helderberg region, and resting on 

 shales which have the appearance of 

 the normal Hudson river shales in other 

 parts of the Helderbergs. These beds 

 are very unlike the more friable look- 

 ing sandstones which underlie the 

 Braynfan shales conformably. This and 

 the resemblance to the Hudson river 

 bods are the only evidence so far obtained 

 that the lowest beds of this section are 

 Hudson river. They may however be- 



