Luther — Economic Geology of Onondaga County. 



in Alvord's grey lime quarry, a fissure four inches wide has been worn at 

 one point to a foot in width, by the surface water that poured through 

 here to unknown depths below; and thirty rods east of the quarry occurs 

 a chasm three or four feet wide, partially choked by dislodged blocks of 

 limestone. By the side of the railroad midway between Beahan's and 

 Alvord's lime kilns the summit of an anticlinal fold in the upper part of the 

 Gypseous shales is exposed : and near Tod's gypsum quarry the magnesian 

 limestones of a low ridge have been extensively flexed and fractured. On 

 the south side of the road leading from Manlius to Jamesville, near its cross- 

 ing with the town line of Dewitt, the top of the Corniferous limestone is 

 exposed in the bottom of the ravine near the schoolhouse, and in another 

 ravine one-half mile to the west. A steep upward inclination toward the 

 south beginning near the road is continued twenty-five or thirty rods, elevating 

 the strata at least sixty feet. 



In Britton & Clark's quarry a thirty-foot section of an anticline shows 

 several vertical fissures, the widest being eight inches, extending below the 



Figuhe 11. Overthrnst flexure and fault in C. H. Russell's quarry at East Onondaga. 



bottom of the quarry. At C. H. Russell's quarry near East Onondaga, the 

 floor at the west end shows a fine syncline, and at the opening in the south 

 wall near the east end, the fracture plane of an upthrust fault is exposed. 

 The dip of the fracture plane is twenty degrees toward the south, and the 

 displacement of the strata is forty-two feet. The floor of the quarry south 

 of the fault for about one hundred feet is level, then dips to the south again 

 at an angle of twenty-eight degrees, twelve feet to the end of the excavation. 

 The wall of House's quarry south of the old arsenal at East Onondaga, can be 

 seen from the opposite side of the valley, showing the arched strata of an 

 anticline. At the Reservath >n quarries, the limestones show little disturbance 

 except near the southwest corner. In the vicinity of Belle vue heights, the 

 magnesian limestones where exposed are folded and broken, and at Decker 

 street there is a fissure ten inches wide filled with brecciated travertine. At 

 Split Rock the strata are but slightly folded, though some wide and deep 



