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In the extreme north, in the Verkhoyansk range and in the mountains of the Taimyr peninsula, there are indications of another zone of folding of Mesozoic or later date, but our information concerning these ranges is very scanty.

The Triassic deposits of the Verkhoyansk Range show that this land did not extend to the Bering Sea, while the marine Mesozoic deposits of Japan on the east, the western Tian-shan on the west and Tibet on the south give us some idea of its limits in other directions.

About half-way the Verkhoyansk range is crossed, and here vegetation ceases and the country becomes wild in the extreme.

The fifty versts between this place and the stancia of Beté-Kul were rapidly accomplished, and during this stage we came in sight of the Verkhoyansk range, a chain of precipitous mountains which would form one of the chief stumbling-blocks to the construction of the proposed All-World Railway.