CONTENTS 



PAG J? 



Geography 1-39- 



Summary of geologic history r41 



Dannemora formation - r47 



Gabbro intrusions r52 



Anorthosite-gabbro ro2 



Mineral content r54 



Augite-syenite r59 



Later igneous rocks r60 



Paleozoic rocks r63 



Potsdam sandstone i*63 



Passage beds r66 



Calciferous (Beekmantown) limestone r66 



Chazy limestone r67 



Morriscnville well r ^8 



Structural features 



Pleistocene deposits r75 



The flat rocks r78 



Economic geology r &0 



Map in pocket on inside of front cover 



