ABSTRACT
My investigations in the upper course of the Kapoewas and its tributaries had convinced me that the trend of the principal lines of dislocation is there from east to west, and my travels in the territory of the Embahoe and the Sĕbĕroewang had shown me, that this same direction prevails not only throughout the Upper Kapoewas territory but also more southward. This in connection with what Schwaner relates about the mountains which form the watershed between the Mĕlawi and the Katingan in South Borneo, made me come to the conclusion that lines of dislocation trending from east to west control the build of the whole of Central Borneo. Therefore it was to be expected that by travelling in a west to east direction, as in the Upper Kapoewas district or in the Sĕbĕroewang river-basin, I should always meet with the same geological formation, or at any rate should find little variety in the structure of the country. But by travelling in a direction from north to south, I should cut right through all the formations, and this would be the only way of procuring a section from which, in connection with my previous investigations, the frame of the geological structure of Central Borneo might be deduced, in outline at any rate.
