i go 



HEREDITY AND EVOLUTION IN PLANTS 



TABLE II. TABLE OF GEOLOGICAL TIME 

 Era Period 



Holocene 



(recent, or the present) 

 Pleistocene 

 (ice age) 



Cenozoic 



Mesozoic 



Paleozoic 



Quaternary 



Tertiary 



Secondary 



Primary 



Archean 



Pliocene 

 Miocene 

 Oligocene 

 Eocene 



Upper Cretaceous 

 Lower Cretaceous 

 (Comanchean) 

 Jurassic 

 Triassic 



Permian 



Upper Carboniferous 



(Pennsylvanian) 

 Lower Carboniferous 



(Mississippian) 

 Devonian 

 Silurian 

 Ordovician 

 Cambrian 



Huronian 

 Laurentian 



133. Pale geography. By changes in the relative level 

 of the land and sea, above referred to, rocks contain- 

 ing fossils may be elevated as dry land, and frequently 

 as mountains, so that remains of marine organisms, as 

 well as of others, are often found at high elevations. In 

 some cases forests near the seashore have been submerged, 

 and covered over with sediment, then elevated again as 

 dry land, so that subsequent excavations have revealed 

 the fossilized trunks and stumps (Figs. 83 and 84). Thus 



