GEOLOGY OF OGDENSBURG 45 



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

 nodules. 



r // 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' lo" 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 

 9. 6" coarse sand-crystal cleavages ; undersurface very ir- 



regular and wielded 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. 



Thin beds of gray dolomite like that just above. 



Subcrystalline dolomite, iron-gray color and full of 

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

 ^' " '^ very brittle and massive; fucoidal markings on upper 

 surface ; shale parting beneath. 



4. i' 11^' Massive bed of dark-gray, finely granular dolomite. 



