GEOLOGY OF THE LUZERNE QUADRANGLE 49 



5 South 10 degrees east. On grano-syenite by the road i^ 

 miles west-northwest of the summit of Black Spruce mountain. 



6 South 15 degrees west. On granite ifs miles a little east of 

 south of Bald mountain. 



7 South 10 degrees west. On granite 20 rods west of the road 

 at its highest point across Hadley hill. 



' 8 South 20 degrees west. On Grenville-granite mixed rocks by 

 the road (now abandoned) three- fourths of a mile north-northeast 

 of Conklingville. 



9 South 5 degrees east. On gabbro by the state road at the 

 north end of Luzerne village. 



10 South 50 degrees west. On Grenville-granite mixed j rocks 

 by the upper road i}i miles east-southeast of Linwood school. 



11 South 10 degrees west. On Grenville-granite mixed rocks 

 by the road one-third of a mile north of Hunt lake. 



12, 13, 14 South 80 degrees west. On Grenville-granite mixed 

 rocks by the road, respectively, just west of Hartman school; ij4 

 miles southwest of Hartman; and ij^ miles west-southwest of 

 Hartman. 



These records indicate that the general movement of the ice 

 across the northern two- thirds of the quadrangle was almost due 

 south, or the same as for the North Creek quadrangle next to the 

 north. Over the southern portion of the quadrangle, however, the 

 striae indicate a strong southwesterly to nearly westerly movement 

 of the ice sheet, these latter records probably having been left by 

 the great waning Mohawk valley lobe of ice. 



Glacial Erosion 



There is no evidence that the topography was very notably 

 affected by ice erosion. It is quite certain, however, that the ice 

 did remove from its original position practically all the Preglacial 

 soil and most of the rotten rock. Further, the vast number of 

 glacial pebbles and boulders of comparatively fresh rock must have 

 been removed, probably by the process of plucking of joint blocks. 

 During transportation they became more or less rounded and 

 faceted. Altogether, however, the total amount of material eroded 

 by the ice made no marked difference in the Preglacial topography. 

 The dumping of Glacial and Postglacial materials in the valleys 

 during and after the ice retreat has probably altered the topography 

 more than the ice erosion. 



