The Geology of Bingham. 



11 



General Remarks. 



Hamilton Period. 



Chemung Period. 



Catskill Period. 



Land Plants : 



Lycopods, Ferns, and 



Conifers. 

 Corals in great numbers, 



Echinoderms, Trilo- 



bites. 

 Fishes, first appearance 



of in American rocks: 



Sharks, Ganoids, Placo- 



derms ; but no osseous 



species. 



Land Plants : Lycopods, 

 Ferns, Eqoiseta ; but as 

 yet no flosses. 



The Vertebrates are rep- 

 resented only by Fishes. 



Goniatites, a group of Ce- 

 phalopods first appear. 



Land Plants of like gen- 

 era as in the preceding 

 period. 



Trilubites, so abundant in 

 former periods, have be- 

 come rare. 



Remains of life rare. The 

 plants are similar to 

 those of the Chemung 

 Period. 



The change in life during 

 the Devonian Age was 

 marked by the introduc- 

 tion of many new forms 

 and the extinction of 

 many old ones, as in pre- 

 vious ages. 



which corals of great variety 

 flourished. 

 The climate was warm, and proba- 

 bly so over the Arctic regions. 



Articulates of the Myrio- 

 poda, a class allied to In- 

 sects, worm-like but having 

 many segments and nu- 

 merous feet, first appear in 

 the Devonian Age. 



True Insects, of the class 

 Herapoda, appear in several 

 species. 



In the Hamilton Period, extensive 

 forests of Lycopods. some similar 

 to modern spruces and pines and 

 others widely different from any 

 known family, undoubtedly ex- 

 isted, as shown by the Lepido- 

 dendra and Sigillaria found in 

 the strata. 



At the close of the Devonian Age 

 the area of the continent had 

 much increased, and embraced a 

 large part of East Canada and 

 New England, but the greater 

 part of North America yet re- 

 mained beneath the waters. 

 Neither the Rocky Mountains 

 nor the Appalachians yet existed. 

 The Green Mountains were low 

 hills compared with their present 

 height. 



Great" disturbance seems to have 

 followed the close of the age over 

 the eastern part of the continen- 

 tal area leading to elevation of a 

 great portion of Maine, etc. 



The occurrence of Devonian species 

 in the Arctics shows, as Dana 

 remarks, that there was but little 

 diversity of climate between the 

 regions" now called Temperate 

 and Arctic Zones. 



