EIGHTH 'JURASSIC PERIOD. 



no difference of climates such as the present then existed, 

 had the intertropical character. 



All 



EIGHTH JURASSIC PERIOD. 



380. The strata deposited during this period, called by 

 D'Orbigny the Coralline stage, correspond to coral rag of British- 

 and German geologists. 



381. Exclusive of annulata, the following table represents the 

 fauna of this period. 



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

 Eirjhtli Jurassic Period. 



382. In Russia, all that tract which extended to the Frozen 

 Ocean, and which had been submerged during the seventh period, 

 was now again raised above the waters, and became land. In 

 England, France, and Germany the general forms of the land 

 remained the same, but their extent was augmented by the 

 general retirement of the shores of the seas. 



383. The fauna of this period was remarkable for numerous 

 polyparia of the coral class, by which reefs were formed similar 

 to those which exist in the present seas. It was at this epoch 

 that the Diceras, Nerinea, Purpurina, Hemicidaris (figs. 168, 

 169), Acrocidaris, Mijlecrinus, and Apiocrinus attained their 

 greatest specific development. 



384. In the total absence of all organic remains of a terrestrial 

 fauna, we must infer by analogy that the fauna of this must have 

 been related to that of the antecedent periods. The flora, 

 according to the observations of M. Brongniart, consisted of ferns, 

 cicadeae, and conifers of peculiar species. 



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