xxiv TABLE OF CONTENTS 



PAGE 



14. Characteristics of Inclusions in Sand Grains 716 



15. Organic Remains 717 



16. Concretions 718 



Accretions (719); Intercrctions (719); Excretions (720); 

 Incretions (720) 719-720 



17. Secretions . 72 1 



Bibliography XVII 721 



CHAPTER XVIII. 



Overlap Relations of Sedimentary Formations 723 



Progressive Overlap 723 



A. Marine Progressive Overlap 723 



I. Rising Sea-level or Positive Diastrophic Movement 724 



• I. Transgressive Movement 725 



a. Rate of Depression Ecjuals Rate of Supply (725); Older 

 Examples (728) ; b. Rate of Depression Exceeds Rate of Sup- 

 ply 725-731 



2. Regressive Movements 732 



c. Rate of Depression is Exceeded by Rate of Supply 732 



II. Stationary Sea-level 733 



III. Falling Sea-level 733 



Characteristics of Regressive Deposits (734); Burial of Re- 

 treatal Sandstone by Sul^sequent Transgressive Movement. 734-735 

 Examples of Intercalated Sandstones from the Palaeozoic and 



Mesozoic; Formations of North America 738 



The Saint Peter Sandstone (738) ; The Dakota Sandstone. 738-739 



B. Non-marine Progressive Overlap 739 



The Pottsville Series, a typical Example of Non-marine Progressive 

 Overlap 741 



C. Replacing Overlap 743 



Bibliography XVIII 744 



CHAPTER XIX. 



Metamorphism of Rocks 746 



General Definitions (746); The Forces Producing Metamorph- 

 ism (746); The Region of Metamorphism (747); Character- 

 istics of the Zones of Metamorphism (747); Kinds of Meta- 

 morphism 746-748 



Static Metamorphism or Diagenism 750 



I. Lithification or Induration 750 



Lithifi cation or Induration of Clastic Rocks (751); i. Welding 

 (751); 2. Cementation (753); Quartzites and Novaculites (755); 

 Lithification of Clastics Largely a Supra-marine Process. . . .751-755 



II. Recrystallization 755 



Pressure Phenomena due to Recrystallization (Enterolithic 

 Structure) 756 



