Xvi BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



Mather : 



Figure 8 — El Chorro, in the canyon through which Rio Vitiacua 



20 



traverses the Sierra de Aguarague near Machareti. 

 9 — Gorge in the eastern half of the Sierra de Aguarague. . 722 

 II — Dip slope of the westernmost hogback of the Cuestas 



de Pipi 



11 — Sierra de Aguarague 



12 — Lowest beds in the Sierra de Mandiyuti 



13 — Machareti formation 



14 — West portal to gorge cut by the Rio Charagua through 



the Sierra de Charagua 



15 — Upper sandstone member of the Tacuru formation 



16 — Conglomerate in the basal part of the Tacuru formation 

 17 — Steeply inclined, fossiliferous beds of the Tatarenda 



formation 



" 18 — Diagrammatic sections across Front ranges of the Andes 



in central Bolivia 751 



11) — Tectonic map of the area shown in figure 1 



20 — Sketch map and structure section of a portion of the 



Sierra de Charagua, Bolivia 



" 21 — North bank of Rio Parapiti 756 



Washington : 



Figure 1 — Sketch map of the distribution of the Deccan traps 767 



2— Sketch map showing the main central area of the 



Siberian basalts 



Ulrich : 



Figure 1 — Sketch map showing localities studied 823 



2 — Correlated lower Chester or Montesana sections 826 



I 5 plates ; 115 figures.) 



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