8 CONTENTS 



PAGE 



XXII. THE COMANCHEAN PERIOD 414 



XXIII. THE CRETACEOUS PERIOD 418 



THE MKSOZOIC ERA IN NORTH AMERICA .... 430 



QUESTIONS . 432 



XXIV. THE TERTIARY PERIOD ... 433 



LIFE OF THE TERTIARY PERIOD 442 



QUESTIONS 446 



XXV. THE QUATERNARY PERIOD 448 



THE GLACIAL EPOCH OUTSIDE OF THE ICE SHEETS . 457 



ANIMALS OF THE GLACIAL EPOCH 460 



THE RECENT EPOCH . . . . . . .463 



QUESTIONS 465 



INDEX 467 



