CONTENTS 



PAGE 



Introduction 51 



Geographic outline 51 



Rocks , 53 



Crystalline limestone 53 



Quartzite 54 



Grrani te 54 



Gneiss 55 



Anorthosites ^ 57 



Trap dikes 58 



Moraines 59 



Water- sorted sands and gravels 59 



Geologic age 60 



Relief map — based on tbe Lake Placid and Mt Marcy sheets of the U. S. 



geological survey opp. p. 62 



Mineralogy 63 



Geologic map of the area around Lake Placid see cover p. 2 



Index 65 



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