Riks — Geology of Orange County. 



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contact, the granite becomes an aggregate of light green monoclinic pyroxene 

 and scapolite, or a granite-like zone of the two is present. Titanite is a 

 constant associate. 



Near the contact, great quantities of silicates appear in the limestone 

 either in bunches or scattered through it. They are brownish green horn- 

 blende, dark brown biotite or phlogopite, green pyroxene, titanite, pyrite, 

 calcite and some scapolite. Chondrocyte is sometimes present in great 



FIGURE 1. Section from southwest side of Mount Adam, northwest towards the Drowned Lauds. 



quantities. A good contact is to be seen on the prolongation of Mount Eve 

 on the farm of Mr. Onderdonk and on that of Mr. J. Hedges. On the 

 southwest side of Mount Adam is an excellent section across the granite, 

 limestone and contact zones. (Fig. 1.)* Next to Mount Adam is a very 

 swampy strip, following which there is a ledge of limestone with much 

 red chondrodite. Beyond this comes the granite with the scapolite zone. 

 Unusually fine scapolite crystals were found here, with interlaced prismatic 

 pyroxene individuals. Titanite was present in less quantity. The scapolite 

 zone is followed by coarse white limestone, and this, in turn, dips under the 

 gravel bordering the Drowned Lands. 



About two miles west of Amity is Pochuck mountain, the greater 

 portion of which lies within New Jersey. The eastern part of the 



Figure 2. Section across tbe north end of Pocbuck Mountain. 



mountain is composed of a coarse-grained granite, which is quarried for 

 building purposes. The eastern half of the mountain is a biotite gneiss 

 (508), which strikes N. 20° E. ; dips 30° W. Dikes of the granite penetrate 



* This section is copied from Prof. Kemp ami Mr. Hollick's paper, previously mentioned. 



