CONTENTS 
PRE-PAL/EOZOIC AGES. 
CAMBRIAN PERIOD 
SILURIAN PERIOD 
DEVONIAN PERIOD 
CARBONIFEROUS PERIOD 
PERMIAN PFRIOD 
TRIASSIC PERIOD 
JURASSIC PERIOD 
CRETACEOUS PERIOD 
EOCENE PERIOD 
OLIGOCENE PERIOD 
MIOCENE PERIOD 
PLIOCENE PERIOD 
PALEOZOIC AGE 
MESOZOIC AGE 
CAINOZOIC AGE 
QUATERNARY AGE 
PLEISTOCENE PERIOD. 
EPOCH OF GREAT GLACIATION 
AN INTERGLACIAL EPOCH . 
EPOCH OF GREAT RE-GLACIATION . 
FINAL RETREAT OF THE ICE 
MODERN PERIOD 
NOTES . . . . 
LIST OF PRINCIPAL BOOKS CONSULTED 
INDEX 
FASE 
I 
II 
IS 
*3 
3 
39 
43 
59 
77 
100 
121 
'35 
'49 
'73 
,87 
'94 
198 
207 
M5 
XI 
