Studies for Students 



RELATIONS BETWEEN CLIMATE AND TERRESTRIAL 



T>Y.VO^T£?,— Continued 



JOSEPH BARRELL 



Yale University, New Haven, Conn. 



Part II. Relation of Sediments to Regions of Deposition 

 Introduction. 



Influence of nature of surface of deposition. 

 Piedmont slopes — aerial deltas. 

 Lower flood plains — aqueous deltas. 

 Elimination of local geographic factors. 

 Climatic influences in regions of deposition. 

 Effects of constantly rainy climates. 

 Influence of arctic climates. 

 Chemical nature of deposits. 

 Effects of intermittently rainy climateis. 

 Intermediate character of deposits. 

 Organic characteristics. 



Conclusion on unappreciated extent of such deposits. 

 Effects of semiarid climates. 



Chemical and structural characteristics. 

 Floral characteristics of semiarid flood plains. 

 Effects of arid climates upon fluviatile deposits. 



Chemical characteristics. Evaporation deposits. 

 Combinations of fluviatile and acolian structures. 

 Organic characteristics. 

 Ease of recognition in the geological column. 

 The climatic significance of color. 

 The origin of red formations. 

 The origin of light and variegated colors. 

 The origin of gray to black formations. 

 Conclusions on Climatic Influences in Regions of Deposition. 

 PART II. RELATION OF SEDIMENTS TO REGIONS OF DEPOSITION 



Introduction 

 Upon a comparison of the character of the deposits laid down upon 

 the topographically somewhat similar surfaces of large deltas but 



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