REPORT OF THE STATE PALEONTOLOGIST 1902 1135 



quarry shows 6 feet of Salina waterlinie, with 4 feet, 8 inches of 

 Cobleskill. The Stromatopora layer forms the upper surface of 

 the Cobleskill. 



The location of this quarry is about 85 feet above the lake, 

 which shows that the average dip of the Cobleskill is about 120 

 feet a mile. It should be noticed however that in this region 

 the dip varies greatly. This is due largely to the fact that the 

 flexures of the strata have been produced by two sources and at 

 different times. One set of flexures evidently is produced by 

 horizontal pressure resulting in a general tilting of the rocks, the 

 other by vertical pressure from below producing local disturb- 

 ances, sometimes locally counteracting the effect of the general 

 tilting of the strata and sometimes producing low conical eleva- 

 tions, showing that the pressure was applied at a single point. 



The pressure producing these local disturbances appears to be 

 due to the increase in bulk of the underlying beds, in the form- 

 ation of gypsum from its anhydrite. These beds of gypsum ap- 

 pear to be forming at the present time and they offer other inter- 

 esting features, which can not be considered here. Excellent 

 examples of these local disturbances can be seen in the field just 

 north of O'Connor's quarry, where the Cobleskill is elevated into 

 two cones, each having an elevation of 6 feet at the apex, where 

 the rock is much broken and fissures are seen radiating from the 

 center. 



A short distance northeast of O'Connor's old quarry and at 

 15 to 20 feet higher there is another quarry in which 8 feet of 

 Rondout waterlime is exposed. It will be seen from the position 

 of these two quarries that the Cobleskill here holds the same posi- 

 tion that it does in Schoharie county, namely, above the Salina 

 and below the Rondout. The waterlime exposed in this quarry 

 appears to be a good cement rock. It is dark in color, shows 

 faint lines of deposition, and a tendency to split along these lines. 

 A single segment of Eurypterus was found in the waterlime 

 exposed in this quarry. 



The Cobleskill limestone again appears in the old quarry on 

 the land of Mr John Wooley, about % f a mile south of Cross 

 Roads. The part of the limestone which is exposed, is hard, dark 



