TYPICAL SECTIONS OF THE JURASSIC 



647 





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Figure 4. — Oxfordian and Lusitanian Mack Shales with Ammonite accretions 

 The photograph was taken at La Giiira, 4 kilometers west of San Diego de los.Bauos. 



Figure 5. — Organ Mountains 



Showing ocean sculpturing. Old schistose shales at base overlain unconformably by 

 the Jurassic limestones. Vinales at the right, beyond the hill in the foreground. View 

 toward northeast. 



