Ill III 



Discussion of the Stratigrarhy 453 



The geographical sequence, 453 ; Evidence of the 

 mollusca, 454 ; Evidence of the corals, 455 ; Form- 

 ation of the Yaqui valley, 456 ; Suggested analogies 

 with Porto Rico, 457 ; Correlation of the Yaqui 

 valley horizons with those of France and Florida. 



Correlation Table , 460 



Index to Vol 463 



ILLUSTRATIONS. 



Plate 66. a. Rio Yaguajal near Sabaneta ; b. Bluffs, Rio 



Mao at Cercado 426 



67. a. El Morro de Monte Cristi, Northern End. 



b. Bluff 3, Rio Mao at Hato Viejo 434 



68. a. Zone H, Rio Cana at Caimito. 



b. Zones A and B ; Rio Gurabo at Los Quemados. 450 



