ADIRONDACK MAGNETIC IRON ORES 



129 



1000 to 1500 feet increasing to the southeast in the direction of 

 the interior uplifts. Though the contours are generally rugged, 

 due to succeeding lines of ridges, there are few notable prominences 

 and the hills rise scarcely more than 500 feet above the valley 

 bottoms. 



Fig. 21 Sketch map of the St Lawrence county magnetite deposits. Ore bodies shown by 



heavy lines 



^The geology of this part of the Adirondacks has been investi- 

 gated only in its broad features. No maps adequate for a detailed 

 survey are available, and until they are forthcoming a systematic 

 investigation must necessarily be postponed. It is to the recon- 

 naissance carried out during recent years by C. H. Smyth jr, that 



a 



