EEVIEW OP THE CHALK FOBMATION. 391 



hundreds of species which composed the Fauna and the 

 Flora of the cretaceous group, not one species passed into 

 the succeeding epoch. 





EXEECISES 



ON THE CHALK FOBMATIOtf. 



1. Describe the geographical distribution of the chalk. 



2. State the distinctive features of this formation. 



3. Enumerate the separate divisions of these strata in this 

 country, and the mineral character, distinguishing features, 

 and general characteristics of each. 



4. State the opinions heretofore entertained of the origin 

 of chalk and flint. 



5. Explain those of later observers. 



6. Describe the physical geography of the formation, and 

 point out the area of the denudation of the chalk. 



7. Name the remarkable fossil remains discovered in this 

 formation. 



