002 



Report of the State Geologist. 



of the Lee ore near Port Henry and the Vineyard openings on Buck 

 mountain, in Tieonderoga. Near Olmsteadville and in the valleys to the 

 eastward, limestones and the characteristic schists and gneisses that accom- 

 pany them are frequent. The same statement holds true along the highway 

 that runs west and then southw est to North River. At No. 110 is a light 

 quartz gneiss, at No. Ill a white crystalline limestone, and in between are 

 dark hornblendic schists and thinly laminated gneisses such as usually 

 accompany the limestone. Quartz veins of inconspicuous character are often 

 seen. At No. 112, in the creek bottom and on the east bank, is a fine out- 

 crop of a thinly laminated, richly quartzose gneiss. Limestone appears near 

 the town of North River in the east bank of the Hudson, and further up 

 stream are cliffs of gneiss nearly 200 feet high. Along the highway to Blue 

 Mountain lake, alternating exposures of gneiss and limestone are met to the 

 town line, except just east of No. 115, where a gabbro excessively basic and 

 somewhat schistose and rich in magnetite appears. From No. 113, for a mile 

 or more, a superb fault scarp is on the north side of the road, where the dip 

 and strike sign is located. It exposes a precipitous front of gneiss, and has 

 a small prospect hole for garnet well up on its sides. 



Passing now along the highway in the eastern central part of the town 

 from Olmsteadville to Newcomb, the same alternations of gneisses and 

 limestone exposures are met as far as No. 123, which is a mile or less south 

 of Aiden Lair. Gneissoid rocks belonging to Series III then appear and 

 extend off to the northeast beyond Hewitt pond and no doubt connect 

 with the areas north of Bailey's pond in Schroon. They are described 

 under the next series. At the crossing of the Boreas river, quartzose gneisses 

 again crop out at Nos. 125 and 126, but gabbro and black hornblendic 

 schists lie both south and north of them. Beyond Van de Whacker creek is 

 No. 128, a coarse quartz-orthoclase gneiss, with the two minerals in lenses 

 just as was noted for Schroon, No. 97, and Jay, No. 6, the latter from 

 Haystack mountain. 



Along the road that branches off to the North Woods Club near the 

 middle of the town, black schists and gray gneisses are crossed as far as 

 the Boreas river. Beyond its bridge, limestone of the usual graphitic white 

 variety is the principal rock exposed. No. 1-11 was the last outcrop that I was 

 able to reach, so that a great area in Minerva and Newcomb to the north- 

 west remains unstudied, but I have little doubt, both from its abundant 

 lakes and moderate hills, that it will all prove to contain the usual asso- 

 ciation of limestones, schists and gneisses. 



