XXIV 



THE EARTH BEFORE HISTORY 



MAPS 



I. The Conformation of Land and Sea in the 

 Northern Hemisphere at the Beginning 



of the Primary Period. . . . 333 



II. The Continents of the Cambrian Epoch . 334 



III. The Earth of the Jurassic Period . . . 335 



IV. The Earth of the Nummulitic Period . . 336 



