I48 NEW YORK STATE MUSEUM 



can be relied upon, it is safe to infer that a bed of the Dixon schist 

 should have underlaid the hill before the injection of the igneous 

 rock. Thus the pegmatite may have derived the graphite from the 

 Dixon and deposited the graphite upon contact with the higher 

 lying beds such as the amphibolite in the Young Lion pit, which 

 may be the Beech Mountain rock, etc. 



The slightly contact metamorphosed type. The enriched ores 

 of the International, Rowland and Sacandaga properties probably 

 were developed by a mild form of this absorption and redeposition 

 action of the thermal waters upon the graphite of the original Dixon 

 schist, causing a concentration-enrichment effect. 



Summary. Thus it is concluded that the graphite in the Adiron- 

 dacks has been formed by several distinct and rather complex 

 processes. The organic origin is proposed to explain the Dixon, 

 Bear Pond schists, and the Rock Pond " arkosite." The inorganic 

 theory is regarded as the most plausible to explain the contact and 

 vein deposits, while a combination of the two is held to account for 

 the International-Rowland-Sacandaga type and perhaps some others. 



