1136 NEW YORK STATE MUSEUM 



in color and has a thickness of 4 feet. The Stromatopora bed 

 forms the upper surface. Below the Cobleskill there is exposed 

 12 to 15 feet of Salina waterlime, which becomes laminated and 

 shaly on exposure. In the Salina a short distance below the 

 Cobleskill, Lingula sp. undet. occurs. 



A cut on the Lehigh Valley Railroad, y 4 of a mile east of Cross 

 Roads station, passes through beds of gypsum at what is known 

 as the Thompson quarry. Above the gypsum in the banks east 

 of the pit, there are about 25 feet of Salina waterlime, overlain 

 by the Cobleskill, which is here much folded and broken. The 

 upper part of the Cobleskill is covered, but the overlying dark 

 Rondout waterlime shows slightly in the top of the cut on the 

 south side and in the field above. Near the middle of the Salina 

 waterlime in this cut fossils are quite abundant. Several species 

 of brachiopods and fragments of Eurypterus occur. The 

 Lingula sp. undet. already mentioned as associated with the 

 Eurypterus at Howland's point, is found here extending to near 

 the base of the waterlime. With the exception of a species of 

 Leperditia, this Lingula appears to be the lowest fossil above the 

 gypsum beds. 



The elevation of the Cobleskill in this cut is 510 feet A. T., 

 which is 120 feet higher than Frontenac island. This outcrop in 

 the cut however is on the other limb of the anticline, with a dip 

 strongly toward the northwest, showing that the actual dip of 

 the rocks is much greater than the above figures would seem to 

 indicate. 



Manlius limestone at Union Springs 



The best exposure of the Manlius limestone in the vicinity of 

 Union Springs is in the J. S. Shaliboo quarry, 1 mile south of 

 the village. The part of the Manlius that is exposed is directly 

 below the Oriskany sandstone. The upper layer of the Manlius 

 is 4 feet 5 inches thick and quite free from Stromatopora, but 

 Leperditia alta Hall and a small species of Tentaculites 

 are very abundant. The next layer below is a fine, dark blue 

 limestone containing much Stromatopora. This is the layer 

 which in appearance is similar to the middle layer of the Coble- 

 skill or Frontenac island, to which reference already has been 



