364 STEVENSON 



where it underlies the "Cement rock" of the Waterlime. The 

 only exposure on the east side is that near the African church, 

 but the rock is present along this hill northward and in the Fox- 

 kill valley eastward, as the stone fences hold fragments of it in 

 abundance. Some portions are crowded with Favosites niag- 

 arensis and Stromatopora concentj'ica but other forms are rare. 

 Occasionally one finds a nest of RJiyncJwnella laniellosa with 

 Airypa reticularis and Ptcrinca scairiformis, all well preserved. 

 Besides these are some univalves and cephalopods but for the most 

 part they are indefinite and in some cases even the genus cannot 

 be determined satisfactorily. 



THE ONONDAGA 



The Onondaga, of Dana, is represented only by the Water- 

 lime. The Salina shales, so thick in western New York and per- 

 sistent in southward even to the Baltimore and Ohio railroad^ in 

 Maryland, have no representative here. The physical change 

 from Coralline (Niagara) to WaterHme is sufficiently sharp in 

 that the color changes abruptly from very dark brown (the 

 " blackrock " of the Cement quarries) to dark gray or dull brown 

 while the fracture becomes more earthy and ragged, though the 

 weathered surface of the two rocks is very similar. 



The Waterlime is not well exposed at any point near Scho- 

 harie. The space between J:he Coralline and the Tentaculite on 

 the east side is apparently not more than 1 5 feet, but it is certainly 

 greater on the west side of the river upon the Gebhard farm, 

 where there is a good exposure for more than six feet above the 

 Coralline. The succession is fairly well shown at the Howe's 

 cave cement tunnel, where, in descending from the Tentaculite 

 limestone, one finds 



1 . Flaggy and shaly limestone 31' 



2. '^Bluerock" 2' 6" 



3 . ' * Cement rock " 6' 



In all 39' 6" 



' As ascertained bv I. C. White. 



