STRUCTURE OF THE REGION 429 



include the steep slopes extending upward from the crescent-shaped 

 plateau, the latter being composed of serpentine. At the juncture of 

 the two rock types is a band of garnetiferous amphibolite. An impor- 

 tant fault occurs on the west side of Belvidere. This was first recognized 

 by Professor J. F. Kemp. How extensive the faulting may be was not 

 determined. It is to be said, however, that certain features in the topog- 

 raphy of the western slopes suggest that series of faults may occur to 

 the north and may have been a determinative factor in the minuter 

 topography of this unique and picturesque ridge. On the eastern slopes 

 no faults were detected. Much local crushing and local shearing is evi- 

 dent within the limits of the serpentine. Such shear zones are intimately 

 associated with the so-called asbestos. On the Tucker property, at the 

 foot of the plateau, are to be found certain structural facts which at first 

 suggested the occurrence of a zone of crushing and shearing. At this 

 point a contact between the serpentine and amphibolite is unmistak- 

 ably clear. This was at first regarded, on the basis of a field observation, 

 as a fault, the crushed zone of serpentine forming a very favorable depos- 

 itory for the cross-fiber. It will be shown, however, that the contact of 

 the serpentine with the amphibolite does not represent a fault plane, but 

 an igneous contact. The development of a crushed zone adjacent to the 

 contact is necessarily a subsequent phenomenon. The remaining in- 

 stance of a possible contact relationship is to be found a few hundred 

 yards to the south of the preceding case. Its location is shown on the 

 accompanying map. Here crushed amphibolite was found within a few 

 feet of the serpentine. Whether, as in the preceding case, an igneous 

 contact or a simple fault zone may exist here could not be determined 

 with any degree of certainty, but it is believed the former is the case. 

 Unfortunately the greater part of the rim or foot of the plateau is buried 

 beneath a coat of waste and till, which renders further discovery of 

 structural relationships well-nigh impossible. 



Protruding through the till may be seen excellent exposures of the 

 surrounding schists, which form the valley floors and subordinate ridges 

 in the immediate vicinity. It maintains a very steep dip, with a strike 

 varying from nearly true north to north 20 degrees east. A consider- 

 able variation in the lithologic characteristics of the schists obtain. The 

 variation may be marked in a comparatively short cross-section. Bands 

 of micaceous rock, which at times are apparently talcose to a slight de- 

 gree, are followed by sandy schists, including small lenses of quartz, with 

 an appreciable amount of pyrite. No limestones were found in the 

 vicinity of Belvidere. The positions of a few of the outcrops noted are 

 indicated on the map. The structural features, in conjunction with the 



