40 NEW YORK STATE MUSEUM 



of the formation, above the Heuvelton, but the actual base is not 

 well shown. Beyond, the road has an up grade for a mile and an 

 additional 30 foot thickness of higher beds is shown, bed by bed, 

 in the road gutter. Then a rapid down grade, about half way 

 between Morristown and Ogdensburg carries us back through the 

 same beds and, at the foot of the grade a considerable quarry has 

 been opened in the formation, enabling accurate measurement of 

 the beds. The section in the quarry and just above is as follows: 



Thin, to very thin-bedded, gray, flinty dolomites, with 

 12' occasional thin bands of blue, crystalline dolomite; 

 occasional fossils, chiefly Ophiletas. 



Thin-bedded, gray, flinty dolomite, weathering yellow- 

 brown;. of ten laminated though somewhat irregularly ; 

 often thin partings of blackish shale between the beds. 



Two massive beds of gray, subgranular dolomite with 

 5. 2' i" frequent nodules of coarsely crystalline white and gray 

 calcite. 



4. 3' 10" Thin-bedded, gray dolomite quite like no. 6 above. 



Gray, granular dolomite, similar to no. 5 except that 

 the calcite nodules are of smaller size. 



Dark-blue, finely granular dolomite, often with cal- 

 careous cement, " sand crystal " fashion, and with 

 nodules of flesh-colored, coarsely crystalline calcite, 

 often of large size; thick-bedded, seven beds in all; thin 

 partings of blackish shale between the beds. 



, „ Gray, finely crystalline dolomite ; base not seen ; lowest 

 ^- ^ 9 layer contains sand grains ; irregularly laminated. 



33' 4" total thickness 



Plate 3 is a view of the beds at this quarry, the massive beds 

 below, and the thinner-bedded material above. 



