GEOLOGY OF OGDENSBURG 45 



j// Light-gray, finely granular dolomite, with calcite 

 nodules. 



/ j// Massive bed of dark-gray, granular dolomite with 

 irregular upper surface. 



Massive beds of dark-blue, granular dolomite with 

 calcareous cement of coarse " sand crystal " type ; 

 nodules of coarsely crystalline calcite in most of the 

 12. 5' 10" beds which reach very large size in the top bed, many 

 of 8 to 10 inches in diameter, of very coarsely crystalline 

 calcite, much of which is of brown color; holds Eccyli- 

 opterus. 



Thin bed of flinty, gray, laminated dolomite with very 

 ii. 4" bunchy, irregular upper surface; forms floor of upper 

 division of quarry. 



, A 5 -inch bed of blue and an 8-inch bed of gray, 

 flinty, brittle dolomite. 



Cryptozoon layer of dark-blue, granular dolomite with 

 6" coarse sand-crystal cleavages; undersurface very ir- 

 regular and welded to bed beneath. 



White sandstone with calcareous cement, also with 

 -8. i' 10" very irregular lower surface, making a 6 inch variation 

 in thickness. 



, Two i inch beds of light-gray, granular, porous 



'' dolomite. 



6. 9" Thin beds of gray dolomite like that just above. 



Subcrystalline dolomite, iron-gray color and full of 

 ^ ^, ^,, ramifying streaks of light gray with a reddish tinge; 

 very brittle and massive ; f ucoidal markings on upper 

 surface ; shale parting beneath. 



4. i' n" Massive bed of dark-gray, finely granular dolomite. 



