THE PRE-ADAMITE EARTH. 



geological researches in these regions have supplied data which 

 have rendered the map of M. D'Orbigny the more exact. 



THIRD TERTIARY PERIOD. 



496. The strata deposited during this period, according to 

 M. D'Orbigny, correspond with the middle terrain tertiaire and 

 gres de Fontainebleau of MM. Dufresnoy and Elie de Beaumont, 

 the Tongrian, Rupelian, and Bolderberg strata of M. Dumont, the 

 Molasse of Switzerland, the Faluns bleus of M. Grataloup, and, 

 in fine, with the fifth group of M. D'Archiac. 



497. The second Tertiary period was closed by the convulsion 

 which raised the system of Corsica and Sardinia of M. Elie 

 de Beaumont. Upon the re-establishment of tranquillity, a 

 new fauna was created, consisting of 428 species of Mollusca 

 and Radiata, independently of the vertebrated and annulated 

 classes. 



498. The outlines of land and sea underwent several changes, 

 the results of which will be seen on the map, the seas during this 

 period being indicated by the shading marked 26a, fig. 181. The 

 Paris basin was limited to a space round Paris, between Provins 

 and Evreux, east and west. The Pyrenean basin covered the space 

 similarly indicated and shaded, a tract of dry land, however, 

 remaining to the N.W. of Blay. In Belgium, the seas ad- 

 vanced to the N.E,, as far as Limbourg, in the neighbourhood of 

 Maestricht. 



499. The marine animals of this period, though generically 

 identical with those of the succeeding one, were, nevertheless, 

 specifically distinguished from them. This distinction has not, 

 however, been clearly indicated, except in the case of the Mol- 

 lusca and Radiata, 428 species of which M. D'Orbigny has iden- 

 tified with the deposits of this period. The flora included nearly 

 the same generic forms as in the preceding epoch. 



FOURTH TERTIARY PERIOD. 



500. The strata deposited in this period, according to D'Orbigny, 

 include part of the middle Tertiary and Falunian of MM. Dufresnoy 

 and De Beaumont, the Molasse, Falunian and Crag of M. 

 Cordier, the superior order of Conybeare, and the Miocene and 

 Suffolk and Norfolk Crag of Sir C. Lyell. 



501. The following is the generic summary of the fauna, which, 

 however, includes a certain number of genera of the Vertebrates 

 peculiar to the third stage. 



132 



