154 NEW YORK STATE MUSEUM 



they are broader and more pronounced. Lewey lake is 1651 

 above tide and the Cedar river is 2100. 



Our explorations have been chiefly limited to the southern and 

 central parts of the township. The extreme northwest has not 

 been visited, but, aside from possible limestone and gabbro areas, 

 there is every reason to expect the usual gneissoid rocks. No 

 recorded work has been done very near this point to the west, 

 but the gneisses met by Prof. C. H. Smyth jr at Honnedaga lake 

 and the gneisses with gabbros near Wilmurt lake would give 

 ground for expecting these types. 



Series 1. The gneisses are much the most important rocks in 

 the township, and they present among themselves considerable 

 variety. In the field the greater part was collected as hornblen- 

 dic gneiss. No. 158 has, for example, the aspect of a reddish, 

 hornblendic granite. Nos. 157 and 159 are greatly squeezed, horn- 

 blendic varieties, rusty on exposure, but darker and darker green 

 as one breaks into the fresh interior. They show comparatively 

 little quartz to the eye, but appear to be rather syenitic in their 

 composition. No. 150 is a dark green and apparently somewhat 

 basic rock, but, when it is examined under the microscope, abun- 

 dant quartz is seen: The other minerals are orthoclase, plagio- 

 clase, colorless augite, brown hornblende, and feebly pleochroic,. 

 orthorhombic pyroxene. It is a pyroxene-granite and is very 

 badly crushed and sheared. No. 156 is the same variety of rock 

 as 163a. No. 162 appears to be a very finely crushed pegmatite 

 or haplite, if indeed it is not a metamorphosed 1 feldspathic sand- 

 stone. Dark silicates are very few, though some scales of musco- 

 vite are visible. No. 164 is a greatly crushed and granulated 

 aggregate of quartz, microperthite, plagioclase, orthoclase, and 

 biotite. No. 165 is a fairly massive, hornblende granite or 

 related rock. 



So far as examined with the microscope, all these rocks show 

 the effects of severe crushing and have evidently undergone ex- 

 tensive dynamic metamorphism. Foliation is never lacking, 

 though in some it is more pronounced than in others. The strike 

 of the foliation is somewhat variable, but it is rather more often 



