REPORT OP THE STATE PALEONTOLOGIST 1902 1169 



readily distinguish the Niagara from the adjacent rock masses. 

 At this particular locality the base of the Niagara is a very dark 

 shale, possibly the eastern extension of the Rochester shale. 



Salina beds. The red shales of the Salina are excellently ex- 

 posed along the creek bed and highway which crosses the creek 

 below Wheelock's farm. A considerable portion of the upper 

 Salina is not shown, but the Eurypterus waterlimes are exposed 

 on the Wheelock farm. The total thickness of the Salina can 

 not be much less than 500 feet. 



Cobleskill limestone. The best exposures of this limestone in 

 the vicinity of the Wheelock farm is on the Augar and Morris 

 farms, and in the highway y 2 mile east of Wheelock's. It is also 

 exposed 2 miles east, not far from Steeles creek on the Kolb farm. 

 There are other outcrops of the Cobleskill southeast from 

 Wheelock's near the Palmer cheese factory. Near the latter 

 place the Eurypterus beds are shown in the highway and the 

 Cobleskill outcrops just above, and for a mile frequent expos- 

 ures are seen near the highway leading to Cedarville. 



The thickness of the Cobleskill in Herkimer county is given by 

 Mr Schuchert as 30 feet, but 1 have not been able to find any 

 outcrops where the thickness was so great. Hall states that in 

 Herkimer county it is " only a few feet thick " and observations 

 made about the Kolb farm show a thickness of about 10 feet, 

 though there are places where through the action of the " creep- 

 ing " movement of the detached edge of the outcrop the thickness 

 appears to be greater. The contact of the Cobleskill with the 

 Rondout was advantageously observed at only one point. At the 

 top of the Cobleskill Leperditia scalar is Jones and a 

 large species of Beyrichia were found quite abundantly. 



Rondout and the Manlius formations. The combined thickness of 

 the Rondout and the Manlius is about 100 feet. The Rondout is 

 of a sandy hydraulic nature with but few fossils. In the thin 

 sandy layers Eurypterus are occasionally found. On one slab 

 from the Rondout with Eurypterus there is found R h y n - 

 chonella? lamellata Hall and Whitfieldella sp. 

 The Manlius contains its usual fauna and in this section it is also 

 characterized by many beautiful crinoids. The upper portion of 



