660 BROWN AND o'CONNELL THE JURASSIC OF CUBA 



The faunal zones, while named for successive species of ammonites, 

 are based npon the character of the entire fauna] assemblage at each 

 horizon. Certain species are found in two or more zones and are there- 

 fore not quite so valuable for correlation purposes as are those which 

 have been selected as the zone fossils because of their more limited range. 

 The Upper Jurassic paleontological zones are those which have been 

 recognized in the Argovian, Swabian, and Franconian Jura, the Alpine 

 geosyncline, France and Portugal. Many of the species of these zones 

 range throughout the Mediterranean province from southern France, 

 through the Alps and down into northern Italy, in the Balkans, Asia 

 Minor, and northern Africa. 



COMPARISON OF CUBAN SUCCESSION WITH EUROPEAN STANDARD 



So far, there has been found in the Cuban fauna only one of the 

 European zonal fossils, namely, Aspidoceras perarmatum (Sowerby), 

 but, many of the species which are commonly associated with the zone 

 fossils in Europe do occur in Cuba, so that it has been possible to recog- 

 nize the presence of the upper Oxfordian, the two lower zones of the 

 Lusitanian, the lower Kimmeridgian, and the upper Portlandian. There 

 are a number of new species showing affinities with Bajocian, Bathonian, 

 and Callovian forms; but, since none of the previously known European 

 species of any of those stages has yet been discovered, we hesitate to say 

 positively that those divisions of the Jurassic are represented in Cuba, 

 although there is considerable evidence that they are. 



The Lusitanian and Kimmeridgian species are either identical with 

 or nearly allied to species in the Jurassic rocks of Swabia, Wurttemberg, 

 and cantons Aargau and Baden in Switzerland. The zone of Peltoceras 

 transversarium, recognized at Yihales. Constancia, and La Giiira, con- 

 tains Ochetoceras canalicu latum var. burckhardti O'Connell, which also 

 occurs in Mexico and is a geographical variant of the widespread 0. 

 canaliculatum (Buch) which characterizes this zone in England, France, 

 Spain, Portugal, southern Germany, Persia, and northern Africa. An- 

 other European species characteristic of this zone is Perisphinctes min- 

 dove Siemiradzki, which occurs at Constancia, north of Vinales. It was 

 first described from Poland and has since been found in France and 

 Portugal. Finally, there are several new species belonging to the genera 

 Ataxiocevas, Grossouvria, and Perispliinctes. 



The zone of Peltoceras bicristatum, recognized at Yihales and Con- 

 stancia, is indicated by the occurrence of Ataxiocevas virgulatiun (Quen- 

 stedt), Ochetoceras marantianum (D'Orbigny),. 0. semifalcatum 



