378 



SPECIAL GEOLOGY. 



the existence of extensive lakes is shown by the lacustrine 

 formations of our southern coast and the continent of 

 Europe : the development of volcanic agency is evident from 

 the structure and physical geography of Auvergne ; while 

 a change of climate is evinced by the appearance of 

 crocodiles and chelonians like those of the modern epoch, 

 the creation of mammalia, and the approximation of the 

 genera of shells to living forms ; the gradual introduction of 

 existing plants, and the more European character of the 

 fauna and flora of the tertiary when compared with those 

 of the secondary epoch. 



EXEECISES 



ON THE TERTIARY SYSTEM OF DEPOSITS. 



1. Explain the meaning of the term tertiary. 



2. Describe the geographical distribution of the strata 

 appertaining to these formations. 



3. Name the chief authors and the principal collections of 

 organic remains. 



4. Describe the characteristic features of these deposits. 



5. Repeat the classification proposed by Sir C. Lyell, the 

 names of the divisions, and the relative proportions of shells 

 identical with existing forms which determine them. 



6. Name the most important localities of these beds in 

 this country. 



7. Mention the principal characteristic shells of the crag, 

 and London basin. 



8. Describe the basin of Paris, its extent, and distinctive 

 organic remains. 



9. Name the chief features of the geology of Auvergne, 

 its physical geography, alternation of deposits, fossil remains, 

 and the changes and revolutions inferred from its varied 

 phenomena. 



10. Mention the other deposits of this group occurring in 

 Prance. 



11. Name the fossil remains of Monte Bolca. 



12. Name the localities in which similar phenomena are 

 observed in Europe. 



13. Mention the latest discoveries made with reference to 

 this period of the earth's history in other regions. 



