THIRD CRETACEOUS PERIOD. 



423. The identity of the tropical species found in extremely 

 diiferent latitudes, as, for example, in France and at Magellan's 

 straits, lead to the same inference, as in former periods, of the 

 general prevalence of an equatorial climate at all parts of the globe. 



Fig. 173. Ancyloceras Matheroniauus. 



424. The convulsion which closed this period was, according to 

 M. D'Orbigny, that by which the Fuegian chain of mountains in 

 South America, the direction of which was N. 30. W. and S. 30 E., 

 was raised. 



THIRD CRETACEOUS PERIOD. 



425. The deposit of this period corresponds with the 13th or 

 gault group of Lyell, including the dark blue marl of Kent, the 

 Folkestone marl or clay, and Blackdown beds and green sand and 

 chert of Devon. 



426. A view of the generic forms of the fauna is given in the 

 following table : 



Synopsis of the Animal Kingdom (exclusive of Annulata) during the 

 Tliird Cretaceous Period. 



107 



