Alguns aspectos fisiográficos do Território do Guaporé

Resumo

In this article, Colonel Lima Figueiredo who is thoroughly familiar with the region described by him, gives an idea of the physiography of the Guaporé Territory.

            In the first part he presents a little history of communication between Eastern Bolivia and the Amazon region, from the first attempts to the construction of the Madeira-Mamoré Railroad.

            In the second part, Colonel Lima Fiqueiredo makes a geomorphologic study of the Parecis plateau which may be summarized as follows: "The plateau extends in a Southeast-Northeast direction between the Gi-Paraná and the Guaporé bays, with an altitude of around 600 meters".

- On the Guaporé side, there is a large scarp with wide valleys cutting deeply into the sandstone, which descends easily without brusque falls. To the north, the descent 1s by successive steps showing the bared crystalline base in definite process of epigenesis on various erosion levels. To the east, the descent is small: the Gi-Paraná and its tributaries cut the plateau to such an extent that they give it a "mountainous appearance".

            Colonel Lima Figueiredo considers the problem of the Gi-Paraná elbow, the structural origin of which "is due to the barrier formed by the Machado Serra".

            He also describes a type of residual relief occurring in other parts of Brasil, of "most capricious forms" resulting from eolation and, in the main, pluvial erosion.

            Next, the author describes the Cabixi river, which he considers "as the limits of the Amazon region, for one feels a sharp transition here".

            The article closes with strong praise for the Baron of Rio Branco "who, by his persevering, patriotic labors, assured a national future without wars provoked by boundary questions".