502 NEW YORK STATE MUSEUM 



of the production of waves powerful enough to have an important 

 shaping action upon their shores. Bare rock ledges are a feature 

 of the shores of most of them. Elsewhere they are largely of 

 boulders washed out of the moraines, upon which the waves have 

 a little more effect than upon the ledges. Little deltas appear at 

 some of the brook mouths. Where kame or valley sands form the 

 shores rapid cutting is in progress and rapid shallowing as well. 

 One prominent sand spit has been de\ r eloped on the Long lake 

 shore in the lee of Camp island [pi. 15, 16], with others of less 

 prominence to the south. 



ECONOMIC GEOLOGY 



If the district was, or was ever likely to become, a thickly settled 

 one there are some things that might have considerable economic 

 importance; as it is there is little of that nature. Aside from its 

 iron ore the Adirondack, region shows little or nothing in the way of 

 metalliferous wealth. Within the area of the quadrangle no deposits 

 of iron ore were seen, nor have any ever been exploited, so far as 

 could be discovered, though such are known from all of the adjacent 

 quadrangles, of which the titaniferous ores about Lake Sanford 

 within the Santanoni quadrangle are much the most important. 1 

 These ores are found in the anorthosite and result from its dif- 

 ferentiation, but there are none such found within the anorthosite 

 area of the Long Lake quadrangle except possibly of such minor 

 size that they have been missed during the present survey. Nor 

 have magnetite ore bodies been noted within the areas of gneiss 

 and syenite, in either of which they might occur. In the district 

 between Raquette Falls and Follensby pond there is some local com- 

 pass variation, though it is hardly indicative of any large ore body. 



There is considerable graphite in disseminated form in the Gren- 

 ville rocks, both in the sediments and locally in the igneous rocks, 

 as is usual in the formation, but nothing was seen which would 

 indicate that it is anywhere present in sufficient quantity to form 

 a workable deposit. 



Building stone. In the granite, syenite and anorthosite areas of 

 the quadrangle there is an inexhaustible supply of building stone of 

 fair quality, and much of the granitic Long lake gneiss can also be 

 used for structural purposes. It is not likely that any of the stone 

 is of such high grade that quarrying operations on a large scale for 

 export would be advisable, but there is an ample supply of material 



1 Kemp, J. F. U. S. Geol. Sur. 19th An. Rep't, pt 3, p. 409-19. 



