CONTENTS. 



CHAPTEK I. 



PAGE 



Modes of Formation and General Classification of Eocks, 

 Aqueous and Igneous . . . . . . . .1 



CHAPTER II. 



The different Ages of Stratified Formations Their successive 

 Depositions .23 



CHAPTER III. 



Denudation, Synclinal and Anticlinal Curves, unconformable 

 Stratification, and Waste produced by Chemical action . 31 



CHAPTER IV. 



Igneous Rocks, Metamorphism, Shrinkage and Disturbance of 

 the Earth's crust 38 



CHAPTER V. 

 Laurent ian, Cambrian, and Lower Silurian Rocks . . .55 



CHAPTER VI. 

 Arenig, Llandeilo, and Bala Beds . . . . . .61) 



CHAPTER VII. 

 Upper Silurian Series .... 88 



