RETORT OF THE DIRECTOR AND STATE fiEOLoOIST 



r93 



wood and Clayton roads. All of the features of such occurrences 

 are perfectly shown on a glaciated surface, some hundreds of 

 square feet in extent. The schist here is a light pinkish gfay 

 and might be taken for a fine variety of the granite-gneiss, hut 

 the latter cuts it in every direction in dikes varying from several 

 feet down to a fraction of an inch in thickness. At a few points 

 the tourmalin zone is developed, but it is generally lacking* 



A minor feature, as at many similar localities, is a scries of 

 small dislocations, faulting the dikes two or three inches or less, 

 a great many times, as shown in plate 15. I lore quartz veins 

 are subsequent to the faults, cementing the fissures. 



Similar phenomena are shown along the Clayton road, west 

 of Alexandria Bay. The gneiss is the country rock for several 

 miles, and the almost continuous exposures present many fine 

 examples of inclusions. 



Half a mile south of this road, there is a ridge of schist some 

 two miles in length and a half mile or more in width. The rock 

 is for the most part strongly foliated and banded, with granulitie 

 texture, crumbling to sand when weathered, and of a green or 

 alternating green and pink color. 



Tn composition it is chiefly pyroxene, feldspar and calcite with 

 epidote. Such a schist might be derived from a basic igneous 

 rock or from a very impure limestone, and, as similar rocks occur 

 in association with crystalline limestone a few miles away, the 

 latter origin is assumed as true for this one. 



This ridge is remarkable for the abundance of intrusions of 

 the granite-gneiss; indeed, the writer can recall no other local- 

 ity where the phenomena of intrusion are so beautifully shown. 

 In every direction bosses, sheets and dikes of the pink or gray 

 granite-gneiss break through the dark schist, and the sharp con- 

 trast of color adds much to the clearness and beauty of the ex- 

 posures. 



There is a marked tendency in the intrusions, large and small, 

 to follow the foliation of the schist, and some sheets have the 

 appearance of interbedding; but exceptions to the rule are 



