Abstract

All geologists and palaeontologists agree that the Baikal and trans-Baikal areas entered the continental period of development as early as the Palaeozoic. It was only in the Jurassic period of the Mesozoic (Lower and Middle Jura) that the sea extended into the trans-Baikal area from the region of sea basins in the eastern part of Asia. In the Jurassic period, a long sea gulf stretched where the modern valleys of the Shilka and Onon (the Amur drainage) lie today, reaching 115 ° E. Long., 450 kilometres to the east of present-day Baikal (Sokolov, 1936; Presnyakov, 1940).

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