46 NEW YORK STATE MUSEUM 



Light-gray sandstone with a sHght reddish tinge; full 

 , ^„ of round, floated sand grains set in calcite cement; the 

 ^' layer above should be a Cryptozoon horizon, but none 



shows here. 



2. I' 2" 



Dark-blue, granular dolomite, calcareous cement, 

 occasional sand grains. 



I. 2 



„ Massive, dark-blue, finely granular dolomite, resting 

 on a bunchy-surfaced layer which forms floor of quarry. 



35' 8" total thickness. 



It is believed that these two sections, the one just given and the 

 one at the Pythian Home, can be definitely correlated by means of 

 the two sandstone horizons. The upper sandstone, with the over-, 

 lying Cryptozoon bed, nos. 8 and 9 of this section and 20 and 21 of 

 the Pythian Home section, seems a definitely identifiable horizon. 

 The lower sandstone bed is not so certain, as the thickness of inter- 

 mediate beds is not the same in the two sections. The sandstones 

 are very irregular and seem to shift horizon. Bed no. 13 would 

 seem to be the same as the gray bed at the summit of the Pythian 

 Home section, though thinner here, and there is a thickness of some 

 13 feet of higher beds, giving a measured thickness of 82 feet for 

 the formation, plus the amount, estimated at 40 feet, which is 

 lacking at the base, but appears in the more westerly sections. 



Generalizing the section it may be said that it consists chiefly of 

 three types of rocks, the granular, dark-blue beds with calcareous 

 cement, and with the most frequent fossils, the finer grained, dark- 

 gray beds, and the thin-bedded, flinty dolomites. A small thickness 

 of basal, sandy beds is followed by a thickness of some 15 feet 

 of the blue beds, above which is a prominent zone of thin-bedded 

 dolomite some 20 feet thick, while the remainder of the section 

 consists chiefly of alternations of the dark-blue and dark-gray beds, 

 together with an occasional thin sandstone, generally in association 

 with a Cryptozoon bed. The zone of these sandstones, and the 20 

 foot zone of thin-bedded dolomites near the bottom, are the only 

 ones of sufficient definiteness to be used in horizon determinations. 

 For the remainder the beds are very uniform in their character and 

 their alternations, and the horizon of isolated outcrops is invariably 

 a very uncertain matter. 



