SIXTH REPORT OF THE DIRECTOR I909 I05 



Feet Inches 



14 Hard, whitish, vitreous sandstone 10 



13 Dark blue gray limestone, finely crystalline, heavy 



bedded, frequent grains of fine quartz sand 7 



12 Hard, white, vitreous sandstone 2 3 



11 Dark gray blue, calcareous sandstone, weathering 



to brown, rotten stone, especially above 4 4 



10 Gray, finely crystalline, somewhat magnesian lime- 

 stone, with occasional sand grains; thick bedded; 



upper surface ripple-marked 9 3 



9 Irregular parting of shaly limestone with fucoidal 



markings 2 



8 Gray, subcrystalline limestone, with sparing quartz 

 grains ; lower portion laminated and mottled 



with black films 2 



7 Dark to light gray, subcrystalline, magnesian lime- 

 stone ; thick bedded ; many rounded sand grains ; 



calcite nodules in upper portion 7 



6 Gray, magnesian limestone like that below 1 8 



5 Concealed 1 8 



4 Gray limestone like that beneath but lighter in 



color 1 



3 Fine grained, finely crystalline, gray, magnesian 

 limestone, with fine, interrupted black lines; fu- 

 coidal markings ; sand grains abundant on upper 



surface, otherwise sparse 2 



2 Shelly, laminar, calcareous sandstone, with streaks 



of pure sandstone; fucoidal markings 3 



1 Blue, crystalline limestone with occasional small, 



rounded sand p rains I 3 



Total thickness •. . 112 8 



This section is on the general horizon of the Hoyt limestone 

 of the Saratoga section, though including somewhat more than 

 that, both at top and bottom. It is also the same as the lower 

 portion of the Whitehall section and shows the beds which are 

 concealed there. A somewhat unusual feature of it is the dis- 

 tance upward through which sandstone layers of Potsdam char- 

 acters run. According to Brainerd and Seely's map they re- 

 garded the lower part of this section as belonging to division A 

 and the upper to B. 



