Geological researches in China, Mongolia, and Japan, during the years 1862-1865.

CHINAj MONGOLIAj AND JAPAN. 69
Through this broad tract two minor valleys are indicated, one in the trough that
contains the Aralo-Caspian depression and the lakes of the Barabinsky steppe, and
the other containing the Kara sea, the White sea, the lakes of Finland and the
Baltic.
Beyond the mountains of Norway the great depression occupied by the Sea of
Greenland and the North Atlantic, is one of the best defined in this series of valleys.
Finally, in the vast extent of lowlands of British America we have a great geoclinal depression lying between the Appalachians and the Rocky mountains, forming
an elevated geoclinal valley between N. E, and N. W, systems of elevation; just as
in the North Pacific Ocean we have a depressed valley of the same kind between
N. W, and N E. systems-the Rocky mountains and the Sinians.
Both Prof, Guyot and Prof. Dana have demonstrated the fact that the principal
continental outlines are referable to N, E. and N W. systems of trends,