GEOLOGY OF THE LAKE PLACID QUADRANGLE lOI 



Most of the rocks actually used for such purposes are from the 

 anorthosite and the syenite-granite series. These make a good 

 grade of road metal. Quarries have been opened in Marcy anor- 

 thosite 13^ miles northeast of Upper Jay, and at the southern base 

 of Hamlin mountain; in Whiteface anorthosite just south of The 

 Flume; in normal syenite at the eastern base of Cobble hill, and 

 near High fall ; in a basic phase of syenite by the road i mile north 

 of Malcom pond; in Grenville and Whiteface anorthosite mixed 

 rocks by the road 3^ miles north of Keene; and in weathered 

 Grenville limestone by the road one-half of a mile north of Frank- 

 lin Falls. 



Building Stone 



Fresh rock from most any portion of the great intrusive masses 

 of anorthosite or syenite-granite would yield excellent building 

 stone of great strength and durability, and often of unusual beauty. 

 Two small quarries have been opened at the southern margin of 

 the Pulpit mountain gabbro stock to furnish stone for the construc- 

 tion of a nearby reservoir. No other building stone quarries 

 worthy of special representation on the map were found within 

 the quadrangle. 



Limestone for Lime 



There are several quarries from which Grenville limestone was 

 obtained many years ago and burned to lime in nearby kilns. Ttu'.se 

 are indicated on the map i^ miles north-northwest of Keene; on 

 the hillside 3% miles north of Keene; near Woodruff fall; ;/nd 

 just west of Middle Kilns. 



Iron Ore 



There are two localities from which a little magnetic iron ore 

 was obtained many years ago. One of these is a small opening 

 on the hillside i mile west-southwest of Keene. The ore occurs 

 in small, irregular masses in the syenite and Grenville mixed gneiss 

 area apparently as segregation masses in the syenite. 



The other locality is near the eastern base of Marble mountain 

 about i^ miles southwest of Wilmington. There are two small 

 openings in a rather coarse phase of Whiteface anorthosite, the 

 magnetite occurring as irregular masses up to an inch across in a 

 pegmatite dike. 



Graphite 



As above stated, graphite (so-called "black lead") often occurs 

 in small flakes in the Grenville limestone and certain of the schists 

 and gneisses. So far as the writer could learn, there have been only 



