The Chain of Life in Geological Time / A Sketch of the Origin and Succession of Animals and Plants

by Sir John William Dawson

Fig. 166.—Jaw of Dromatherium sylvestre (Emmons). From the Trias of North Carolina.

Fig. 167.—Myrmecobius fasciatus. A modern Australian marsupial, allied to Mesozoic species.

So soon as the palæontologist passes from the Upper Cretaceous to the Eocene, he finds himself in the domain of the placental mammals, which appear in numerous and large species, and this, not merely in one region, but in every part of the world in which these deposits are known to exist.

Fig. 168.—Jaw, and enlarged molar of Phascolotherium Bucklandi. Stonesfield slate. England.—After Phillips.