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CONTENTS 



Preface 



PAGE 



109 



Part 1. 



The science of geology and its history 113 



Origin of the earth and its crust 114: 



Chemical history of the earth H ' 



Present condition of the earth's interior 118 



Envelopes of the earth H^ 



Components of the earth's crust, minerals and rocks 119 



Minerals 120 



Bocks 123 



126 

 Historic geology 



128 

 Dynamic geology 



Palaeontology 



Development of life 130 



1 S4 

 Physiography and structure 



General classification of geologic time and strata 135 



Pakt 2. 



Geologic formations of New York i3 < 



c & 137 



Synopsis 



138 

 Archaean 



141 

 Proterozoic or agnotozoic 



141 

 Palaeozoic 



170 

 Mesozoic 



174 

 Cenozoic • ■•■;■•• 



Present surface of New York 1 ' 9 



