TYPICAL SECTIONS OF THE JURASSIC 651 



Kimmeridgian, the total thickness being over a thousand feet. The 

 pronounced folding of the underlying schists on which the Oxfordian 

 limestones rest unconformably is well shown on the road to Esperanza, 

 north of the limestone mountains (figure 12). 



Figure 11. — Accretions filled with Ammonites, Fishes, and Murine Reptiles 

 The photograph was taken near Mina Constaucia. 



General Summary of Field Relations and Their Significance 



The Jurassic strata of Pinar del Rio, first seen in the eastern foothills 

 of the Organ Mountains, north of Artemisa, are less than 400 feet thick 

 north of Candelaria, but westward increase in thickness to over a thou- 

 sand feet, in the Vifiales section. Concomitantly with this change in 

 thickness there is an increase in the age of the strata, . lower members 

 of the series outcropping westward. Thus, in the east the Kimmeridgian 

 and Portlandian rest with a basal conglomerate on the old metamor- 

 phosed schists, but westward the Lusitanian and Oxfordian, and perhaps 

 XLIII — Bull. Geol. Soc. Am., Vol. 33, 1921 



