26 



NEW YORK STATE MUSEUM 



LEAD HILL 



( Woodchuck J ,-,~ 



Work- 

 ings 



COARSE CRYSTALLINE 

 CALCITE- VEIN MATTER? 

 PYROXENE CONTACT 

 ROCK WITH GRAPHITE 

 LARGE AMOUNTS OF 

 FIBROUS— PLATY GRAPHITE 

 ALGOMAN PEGMAT1TIC 

 GRANITE & PEGMATITE 

 GRENVILLE PAF<A-AM- 

 PHtBOLlTE I NCLUS/ONS 

 GRENVILLE CRYSTALLINE 

 LIMESTONE 



L_E 



10 20 30 4-0 50 60 70 

 FEET 



W\^\ 



Fig. 4 Geologic reconnaissance map of the " Woodchuck " workings 

 on Lead hill. G. H. Chadwick and H. L. Ailing, 1917. 



