There is an axial zone of Cretaceous and Lower Eocene, and this is flanked on each side by the Upper Eocene and the Miocene, while the valley of the Irrawaddy is occupied chiefly by the Pliocene.
The province falls into three natural divisions: Arakan with the Chin hills, the Irrawaddy basin, and the old province of Tenasserim, together with the portion of the Shan and Karen-ni states in the basin of the Salween, and part of Kengtung in the western basin of the Mekong.
The Burmese are supposed by modern philologists to have come, as joint members of a vast Indo-Chinese immigration swarm, from western China to the head waters of the Irrawaddy and then separated, some to people Tibet and Assam, the others to press southwards into the 1 See also, for geology, W.
Woodthorpe was followed into Burmese fields by many others; and amongst the earliest travellers to those mysterious mountains which hide the sources of the Irrawaddy, the Salween and the Mekong, was Prince Henri d'Orleans Burma was rapidly brought under survey; Siam was already in the 'mapmaking han
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