342 QUESTIONS. 



200. What evidence is there that the climate of this age was quite 

 warm over most of the earth ? What evidence is there that the sun 

 shone clearly then? 



CHAPTER XV. 



201. What were the rocks formed in the Devonian age? Indicate 

 the extent of the Devonian system in this country. 



202. What is its extent in Europe ? Detail the interesting exam- 

 ple of geological investigation mentioned. How prominent were the 

 coral formations in this age ? Mention the remarkable display of De- 

 vonian corals in Kentucky. 



203. What two elegant corals are mentioned as being found in that 

 locality ? What different kinds of rock-making were going on at the 

 same time in the Devonian age ? What is said of Devonian vegeta- 

 tion? 



204. What of Devonian animals ? What of Mollusks ? What of 

 Trilobites ? 



205. What of Crustaceans ? 



206. What is the discovery of Agassiz in regard to the classifica- 

 tion of fishes? Of what value is this to geology? Name the four 

 orders of Agassiz, and state what is said of each. 



207. What is said of the comparative prevalence of these orders in 

 different ages ? Describe the Coccosteus. 



208. Describe the Pterichthys. What is said of the appearance of 

 its remains in the rock? Why is the Cephalaspis so named? 



209. Describe the Asterolepis. 



210. What are comprehensive types ? What is said of their compar- 

 ative prevalence in different ages ? What is said of the tails of ancient 

 fishes ? What of the abundance of fishes in the Devonian age? 



211. What of the state in which their remains are often found? 

 What was the condition of the North American continent at the end 

 of the Azoic age ? What at the end of the Silurian ? What addi- 

 tions were made to it in the Devonian ? What results did upheavals 

 in the west and the east produce at the close of this age ? What re- 

 sults where the city of Cincinnati now stands? 



212. What does Agassiz say of the abundance and richness of Silu- 

 rian remains found in that locality ? What is said of the scenery of 

 the Devonian age ? 



CHAPTER XVI. 



213. Ho-tf does the name of the age of coal differ from the names 

 of the other ages? What peculiar propriety is there in the name ? 



