GEOLOGY OF THE BLUE MOUNTAIN QUADRANGLE 65 



northeast of Long Lake village. From two or three small quarries 

 close together i mile northeast of Grove (Deerland) some pink 

 granite has been taken out. Near the dam across the end of Indian 

 lake two considerable openings have been made in the granite 

 porphyry to furnish stone for the masonry of the dam. 



Road Metal 



The building of state roads between Grove (Deerland), Long 

 Lake, and Newcomb has caused the recent opening of several large 

 road metal quarries within the quadrangle. One of these is in 

 typical, greenish gray, quartzose syenite on the road i^ miles south- 

 west of Long Lake village. This rock makes a good grade of road 

 metal. 



Another quarry in pink granite, and a third in greenish gray 

 granite are situated along the road about 2^ and 7 miles, re- 

 spectively, east of Long Lake village. On account of their content 

 of mica, these granites are not quite so satisfactory for road work 

 as the normal and basic facies of syenite or gabbro. The large 

 body of gabbro, crossed by the road between 4 and 5 miles east of 

 Long Lake village, w'as not used for state road work but it would 

 have been excellent for the purpose on account of its richness in 

 iron-bearing minerals. 



In some cases the coarse, crystalline Grenville limestone, where 

 sufficiently weathered to crumble easily, is used to repair roads. 

 Such limestone is taken from the pit indicated on the map one-third 

 of a mile northwest of where the road crosses Cedar river. 



Sand and Gravel 



Sand and gravel of good quality are present in abundance, especi- 

 ally in the valleys where the sorting power of Glacial and Post- 

 glacial streams has been most effective. Such materials are taken 

 from many localities for road and concrete work and for making 

 mortar. 



Garnet Deposits 



The development of the gafnet industry in north w^estern Warren 

 county has led to considerable exploration for similar workable de- 

 posits for some miles around Indian Lake village. At two places, 

 indicated on the map, respectively i^ miles southeast and 2^ 

 miles south-southeast of Forest House, several small prospect holes 

 have been opened in the hornblende gneiss which is so commonly 

 associated with Grenville limestone. At the first-named locality the 



