r24 



NEW YORK STATE MUSEUM 



The gneisses are often quite rusty on exposed faces, more so 

 than one would expect from rocks that are so light colored on 

 unweathered surfaces. 



The other exposures of rocks falling under the above descrip- 

 tion are in order from north to south (see map) nos. 59, 60, 58, (30), 

 22, 24, 25, 26, 28, 29, 50, 45, and 65. No. 49 is decidedly more 

 basic and is a pronounced hornblendic gneiss, with hornblende 

 in great excess. These basic bands are occasionally noticeable. 

 No. 57 is a case in point. 



The strike of the gneisses is quite uniformly n 60° w magnetic, 

 or about n 70° w true, and this same bearing holds true over a 

 wide area adjacent to the town. 



Series 2 No crystalline limestones were observed in Caldwell, 

 but they are known in neighboring towns. 



Series 3 The eruptive gabbros are found in two places, one at 

 no. 39 on the north and one at 23, northwest of the Prospect 

 house, on the mountain of the same name. No. 39 is a well de- 

 veloped dike which is cut by a pegmatite vein, 8 inches thick. 

 No. 23 has been examined with the microscope. It ie greatly 

 granulated and consists of large crystals of plagioclase, rendered 

 opaque in the centers by a dust, probably of spinel and pyroxene, 

 of garnet, hypersthene, brown hornblende, and green augite. 



No dikes of the common basaltic kind were observed, anywhere 

 in the town. 



Calciferous limestone. Two exposures of this formation have 

 been noted, both of which already appear on the state map. One 

 runs along the shore of the lake in the northeastern corner of 

 the town and one appears at the southeastern corner of Lake 

 George. The latter may extend farther south under the sands. 

 The rock is a dark, gray silicious variety, devoid of fossils, and 

 the dip is flat. Each exposure is a block dropped in by faulting. 



Queen slur y 



Topography. Queensbury is a very large town of an irre- 

 gular shape. It extends from the Hudson river on the south 

 at Glens Falls to Lake George on the north and forms the shore 

 of the lake itself for about 4 miles. The town is 15 miles in 



