Limestones. 101 



these joints is favorable to economical quarrying. The place is 

 worked irregularly. 



Glens Falls. — The Hudson river gorge at Glens Falls affords a 

 good vertical section of the Trenton limestones, and two large quar- 

 ries are opened in its sides. The quarry of the Morgan Lumber and 

 Lime Company, on the Saratoga county side, or right bank of the 

 stream, has the following order of beds from the surface : 



1. Black, slaty rock in thin layers . _ 15 feet. 



2. Gray limestone _ 10 feet. 



3. Black, thin-bedded limestone 12 feet. 



4. Gray limestone ._ 2 fecC 



5. Black marble 12 feet. 



6. Limestone. _ 4 feet. 



The top, slaty rock affords some flagging. The gray stone (2) is 

 used for lime. The thin beds of (3) yield stone for rough work only. 

 It is known locally as "buckwheat" beds. No. 4 of this section is 

 good for cut work. The limestone at the bottom is suitable for 

 heavy masonry, but is not quarried here. The beds dip 5° south- 

 ward. The main set of joints is vertical and has a course of south- 

 south-west. 



This company has a mill for sawing the marble. The lime business 

 has, however, taken the place of the marble, and the marble beds are 

 now mined for lime making. 



The quarry of the Glens Falls company is on the north or left 

 bank of the river and below the Falls. Work has been done here 

 for a length of a half a mile, and in places, back at least 100 feet 

 from the river. The vertical succession of beds from the top is as 

 follows : 



1. Gray, thin-bedded limestone ^ 



2. Gray-black, thin-bedded limestone ^18 feet. 



3. " Jointa lime" beds (three) J 



4. Black marble 12 feet. 



The beds dip 4° south. The joints rim south, or a few degrees west 



of south, and a second set east and west, and both are vertical. They 

 are generally several feet apart, and of great service in the quarrying 

 of large blocks. The gray crystalline limestone at the top is sold in 

 the rough for common wall work, or is dressed for sills, lintels and 

 for house trimming. It is a good building stone, but the quarrying 

 of these upper beds is subordinate and incidental to the marble 



