THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Art. XXII. — Block Mountains in New Zealand ; by C. A. 

 Cotton, Yictoria University College, Wellington, New 

 Zealand.* ' , 



Contents. 

 Introdnction. 

 Part I. Block Mountains and Eelated Forms. 



1. Structure. 



2. The Initial Surface. 



3. Possible Types of Drainage. 



True Consequents. 

 Anteconsequent Drainage. 

 Antecedent Drainage. 



4. Sequential Forms. 



Stripping. 



Salients on Stripped Plateaus. 



Mature Dissection of the Undermass 



Fault Scarps and Fold Scarps. 



Composite Fault Scarps. 



Fold Scarps. 



5. Trough Filling. 



Part II. The Block Mountains of Central Otago. 



1. Historical Sketch. 



2. Structure. 



3. Major Tectonic Features. 



The Central Otago System. 



The Northern Highland of Otago. 



4. Drainage. 



The Central Otago Chain of Depressions. 

 The Clutha River System. 

 The Waitaki River System. 



5. The Surfaces of Uplifted Blocks. 



Stripped Plateau Surfaces. 



Details of the Surface on Schist Blocks. 



Salients on Block Surfaces. 



Scarps of the Schist Blocks. 



The Scarps of Greywacke Blocks. 



6. The Floors of the Central Otago Depressions. 



List of Papers to which reference is made. 



* References are listed in full at the end of the article. 



Am. Jour. Sci.— Fourth Series, Vol. XLIV, No. 262.— October, 1917. 

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