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NEW YORK STATE MUSEUM 



Geologic relations of Stark's Knob 

 Stark's Knob igneous mass lies surrounded on the ground by 

 the Hudson river slates. The accompanying sketch map, figure l r 

 exhibits the essential features of the geologic relations. The 

 Hudson slates are highly inclined, cleaved, and much broken 

 rocks. A general northeast and southwest strike of the beds 



Fig. 1 Ground plan of Stark's Knob plug, showing boundaries as they appear when 

 traced on the present surface, with two faults, fff. The close set, parallel lines show 

 the position of outcrops of the Hudson river slates, the arrows the direction of dip; 

 the wide set lines exhibit the average strike of the slates in the vicinity. 



is observed in this district, but in the vicinity of Stark's Knob 

 this direction is departed from on the east quite down to the 

 river road. So far as my own observations go, there are no 

 small dikes radiating from the main igneous mass into the adja- 

 cent cleaved sedimentary rocks, nor are there any noticeable 

 signs of metamorphism in these rocks attributable to the heating 

 Action of the lavas in the plug. The Hudson river group 



