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By Scott W.B

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History, so year, As still less is the the month the millennium in the long is course of the earth's development. In the second place, there are great differences in the con- temporary life of separate regions and such geographical differwe can trace back the ences there have always been, so far as A history of animals and plants. simultaneously originate at least, in a single area all new organism does not over the world but, normally and spreads from that centre until it Such spreading is a slow encounters insuperable obstacles.

Only two or three years ago an expedition from the American has yielded a large Museum of Natural History discovered a place in where the White River beds directly lie Wyoming upon those of the Uinta, thus fully confirming the inference as to the relative age of these two formations which had long ago been drawn from the comparative study of their The palaeontological method date of the stratified rocks is fossil mammals. of determining the geological thus an indispensable means of correlating the scattered exposures of the strata in widely separated regions and in different continents, thousands of miles of intervening ocean.

Great and well founded as is our confidence in fossils as which they occur, it must not be forgotten that the succession of the different kinds of fossils in time was first determined from the superposition of fixing the geological date of the rocks in METHODS — GEOLOGICAL Hence, the containing strata. it is 11 always a welcome con- drawn from the study those inferences can be unequivocally estab- firmation of the chronological inferences of fossils, lished when by the succession in the of the beds themselves.

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A History of Land Mammals in the Western Hemisphere by Scott W.B

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