648 



BROWN AND O'COXNELL THE JURASSIC OF CUBA 



and Vicente, in the mountain pass known as La Puerta del Ancon 

 (figure 6). The black limestones and shales are covered by a stalactitic 

 drip which seals the bedding planes and preserves the rocks from erosion 

 (figure 7). It was here that De la Torre made his first collections, and 

 the locality has since proved to be one of the richest for ammonites. 

 The fossils occur in great numbers in the concretions which are found 

 in the talus at the bottom of the cliffs. About 12 kilometers northeast 

 of Vifiales, at San Vicente (figure 8), the limestones are of Kimmeridg- 

 ian age and contain several new species of ammonites. Along the road 



Figure 6. — Puerta Ancon, looking North 

 Stalactitic drip is shown «>n the face of the cliff. 



the limestones can be seen dipping north on the northern side of the 

 Organ Mountain uplift (figure 9). Six miles northeast of Vihales is 

 one of the massive limestone magotes with the pre-Oxfordian shales and 

 schists forming the lower hills to the north (figure 10). At the foot 

 of this mountain and in many outcrops Dear the copper mine Oonstancia 

 the black limestone accretions are abundant' (figure 11) and they con- 

 tain ammonites, pelecypods, gastropods, fishes, and marine reptiles. One 

 small gastropod, CerLthium cubariensi's, new species, found at Constancia, 

 also occurs at San Vicente and at Finca Rosario. northwest of San Cris- 

 tobal. The age of these strata ranges from Oxfordian through lower 



