i8o 



NEW YORK STATE MUSEUM 



latter protruding from still younger rocks. But it is certain that 

 not only the Cambric belts in eastern New York but also 

 some of the large inliers of basal gneisses along the eastern 

 boundary partake of the nature of folded or anticline inliers; this 

 would seem to be especially clear in the case of the large inlier, 

 beginning near Dover Plains (east of Poughkeepsie) and extend- 

 ing northeast along the Housatonic river. This is surrounded on 

 the west and south sides by a belt of crystalline limestone. The 

 Highlands themselves are a " horst " [see p. 186] as we shall see 

 later. 



at Stissing mountain, N. Y. Scale 



Numerous short, pitching or brachyanticlines that form inliers,. 

 project from the Hudson River shale belt. One of the best ex- 

 amples of this group is Stissing mountain, northeast of Poughkeep- 

 sie [see text fig. 20]. It consists of an elliptic outcrop of gneiss, 

 surrounded by a belt of Cambric rocks on all sides except the north, 

 the whole projecting from the plateau of metamorphic Lower 

 Siluric shales. This outcrop of gneiss is 20 miles away from the 

 larger Housatonic inlier. It also distinguishes itself from the many 

 smaller inliers of Cambric rocks in the neighborhood by the fact 

 that it does not follow the northeast direction of the latter, but 

 strikes due north. This indicates that this remarkable protrusion 

 of gneiss through the thick belt of Cambric and Lower Siluric 



