ILLUSTRATIONS XT 



., Page 



Grout : 



Figure 1— Distribution of standard rock families in a diagram 



showing alkalies and silica 622 



2— Eight series of rocks plotted for each analyzed specimen 624 



3— Rock series showing gradations in single masses 626 



4— Series supposed to be related genetically, but not show- 

 ing clear gradations in the whole range of specimens. 627 

 Brown and O'Connell : 



Figure 1— Block diagram of a section of the eastern part of Pinar 



del Rio Province and northern end of Isle of Pines. . . 642 



2— Lusitanian and Kimmeridgian black shales 644 



3— Section of west side of river San Diego de los Banos ... 646 

 4— Oxfordian and Lusitanian black shales with ammonite 



accretions a , - 



„ ^ . .... 64 < 



5 — Organ Mountains 647 



6 — Puerta Ancon, looking north 648 



7— Details of cliff shown in figure 6 04i) 



S— View looking north toward Esperanza from center of 



mountain valley near San Vicente 040 



9 — A limestone magote fi r )( ) 



10 — A limestone magote ^q 



11— Accretions filled with ammonites, fishes, and marine 



„ reptiles 651 



12— Folded schists north of the limestone mountains on the 



road to Esperanza gg 



13— Ideal cross-section showing the marine progressive over- 

 lap of the successive Middle and Upper Jurassic for- 

 mations from Viiiales to Candelaria 054 



14— Ideal cross-section showing the early Tertiary folding 



and elevation of the strata represented in figure 13. . 654 



15— Paleogeographic map showing the maximum transgres- 

 sion of the sea during Portlandian time. . Rfi9 

 Tilton : 



Figure 1— Location of the area near Stuart, Iowa 690 



2— Map of the area near Stuart, Iowa 6 92 



3— Section from Bridgewater to Glendon, A— B on the map 



of the area fi q , 



4— Section from Glendon to Winterset, B— C on the map of 



the area nc , t 



AT 694 



Mather: 



Figure 1-Map of the Front ranges of the Ancles between Santa 



Cruz, Bolivia, and Embarcacion, Argentina 705 



2— The Sierra de Florida ' ' 70g 



3— East side of the Sierra de Charagua 710 



4— Sierra de Charagua, looking northward 712 



5— Gorge of Rio Saipuru 71 4 



6— North end of the Sierra de Aguarague 710 



7— Canyon of Rio Vitiacua, in the Sierra de Aguarague. . . 718 



