REPORT OF THE STATE PALEONTOLOGIST 1902 1219 



ment crosses the road diagonally and can be traced for some 

 distance to the right into the field and in the opposite direc- 

 tion toward the northeast into the woods. This escarpment is 

 formed by the upper part of the New Scotland limestone, which 

 has here a strike of n. 60° e., dip 55° n. w M and which marks the 

 western edge of the overthrust mass. In the woods northeast 

 of the lane a narrow strip of basal Becraft limestone overlies 

 the New Scotland at the edge of the escarpment, also dipping 

 steeply to the northwest. 



The contact plane of this overthrust can not be seen along 

 the northwest side of the hill, but its course is plainly indicated 

 by the topographic features, the sharp angulation of the slope, 

 and the narrow gully which extends for a short distance through 

 the woods along the foot of the slope. On the north and north- 

 east side of the hill the thrust plane can be readily distin- 

 guished, specially in the cliff over the Glory Hole and Level 

 inclines. Here it is seen as a well marked plane cutting diagon- 

 ally across the cement and Manlius beds at about the hight 

 of the peak of the roof of the head-frame shed [thrust 2, pi. 11], 

 On the eastern slope of the hill, between the engine house and 

 the Hill quarry, this plane seems to rise toward the southwest, 

 and its location is soon lost, probably through dispersion of 

 the fault. 



This thrust is from the southeast, and it involved in its move- 

 ment only the upper layers of the eastern anticline, and shoved 

 these a short distance along an almost horizontal plane toward 

 the northwest till they rested on the southern limb of the 

 western anticline. It seems to belong to the system of minor 

 convergent thrusts, described on page 1215, as imbricating the 

 Manlius limestone in the area north of the engine house. Its 

 position is only a few feet above the uppermost of those thrusts, 

 and its attitude is more nearly horizontal. We see no reason 

 for associating this Vlightberg thrust with the much more ex- 

 tensive White lime quarry overthrust of the North hill, 

 described below. 



The outcrops of Coeymans and Manlius limestone along the 

 lane probably belong to the southeastern limb of the western 

 anticlinal arch. 



