30 NEW YORK STATE MUSEUM 



mount mountain and on the small mountain between i and 2 

 miles north of East Kilns. These dikes are holo-crystalline and 

 mostly badly weathered. They are quite different from any dike 

 rocks hitherto observed by the writer in the Adirondacks. 



Catamount mountain exhibits a remarkable variety of rocks. 

 Within a single square mile from the base of the mountain to the 

 summit, the following rock types are well exhibited : Grenville 

 gneisses and limestone, Whiteface anorthosite, coarse granite, 

 syenite, granitic syenite, aplite dikes, gabbro stock, basic (norite?) 

 dikes, pegmatite dikes, diabase dikes and quartz veins. 



Schroon Lake quadrangle. For this quadrangle Professor 

 Miller reports that the Precambric rocks comprise anorthosite, 

 Whiteface anorthosite, syenite, granite syenite, granite, gabbro, 

 pegmatite and diabase. 



A feature of particular miportance is the outlier of Paieozoic 

 strata in the vicinity of Schroon Lake village. Several large out- 

 crops of Little Falls (?) dolomite occur in and near the village. 

 A small area of Potsdam sandstone was discovered one and one- 

 half miles southwest of the village, but most of the Paleozoic strata 

 are concealed under Pleistocene deposits. 



Li the central portion of the quadrangle, a zone several miles 

 wide, between the great body of anorthosite on the north and the 

 syenite-granite series on the south, exhibits a very mixed lot of 

 rocks, one type which frequently appears being almost certainly 

 an assimilation product between anorthosite and syenite-granite 

 magma. 



Lake Bonaparte quadrangle. The field work on this area has 

 been carried on by Doctor Buddington under the direct super- 

 vision of Prof. C. H. Smyth jr. They report as follows: 



The results of the survey in 19 16 are, in all essentials, con- 

 firmatory of the conclusions regarding this district based upon 

 brief reconnaissances made by the senior author in 1894 and 1897. 

 A detailed report on the region is now in course of preparation, 

 although not yet far enough advanced to warrant more than a 

 slightly modified restatement of the previous conclusions. The 

 dominant trend of the formations is from northeast to southwest 

 throughout the quadrangle. The prevailing strike of the gneissic 

 and cleavage structures is likewise northeast with a variable steep 

 dip to the northwest. The region may be considered in a broad 

 way as comprising three bands of different geological character- 

 'istics. The entire southeastern half of the district is formed by 



