NEW YORK STATE MUSEUM 



ously tilted fault blocks will no doubt furnish other examples of 

 these inliers when fully mapped. Likewise the folded region on 

 the east side of the Hudson and in Orange county contains in- 

 liers whose principal cause is faulting, but all of these are also 

 more or less involved in folding - . 



Fig. 26 Diagram of faulted and tilted blocks in eastern Fulton'county, N. Y. (after 

 Darton). Looking north; showing relations of inliers of text figure 25 to faults 



Where a block has remained standing between two faults inclin- 

 ing away from each other, a horst is produced. This group of 

 inliers has typically the form of a parallelogram or of a rectangle, 

 the greater portion of the Precambric inlier at Little Falls, that 

 to the east of the town, partakes of the nature of a horst by being 

 included between two parallel faults of opposite throw,, as shown 

 by Gushing [see text fig. 27, 28]. 



As a horst of the first order in this State, we have probably to 

 consider the large inlier of gneisses and associated rocks of the 

 Highlands, since Berkey 1 has shown that this block is bounded 

 by two parallel faults between Cornwall and Peekskill. It is 

 stated by Berkey [he. eit. p. 374] that the northern fault con- 

 sists rather of a succession of them, " each separate fault line strik- 

 ing out toward the northeast into the bounding slates and its place 



1 Berkey, C. P. N. Y. State Mus. Bui. 107. 1007. 



