THE HALL OF FOSSIL VERTEBRATES 



South America now in the museum of the Royal College of 

 Surgeons, London. Some of the skeletons are partly restored in 

 plaster, indicated by a red cross (restored bones) or red lines (out- 

 lines ()[ restored parts ^i bones). Bones supplied from other 

 specimens are marked with the catalogue number of the speci- 

 men or are indicated by a reel circle, if uncatalogued. 



GEOLOGICAL AGES AND PERIODS 



zoic 



Quaternary 



< >f Man, 



50.000 years 



Tertiary 



■ >f Mammals, 

 3,000,000 years 





C reta- 



Age < 'f Reptiles, 



• 7,000,000 years 



in rassic 



Triassic 



zoic 



Permian 



Age of Amphibians and Coal 

 Plants. 



5.000,000 years 



Carboniferous 



man 



Age < >f Pish( 



2.000.000 yean 



Silurian 



1 >f Invertebrates, 

 10,000,000 y< 



Cambrian 



Eoz 



loan 



ils) 



Aril; 



These estimates in logical periods given in the 



accompanying table, which is arranged in lerfrom 



the most recent to the most ancient time, must be under- 



1 to be merely very rough approximations. Then- is no 



ro method of finding any exact equivalent in \ any 



1. although the relative length Of each to 

 5 



