The Soils of Deli

The Cultuurgebeid (plantation belt) of North Sumatra depicted in a 1920 map.
Tobacco plantations (represented as dots) in the east coast of Sumatra. From Mohr (1932).
A cutting near Tuntungan showing several sediments from the bottom to top: first, the lipariet tuff started on the left of the picture with a dark colored boundary. This is followed by a dacitic volcanic ash layer, the black spots are charred pieces of wood. On this rests a very thin layer of extremely fine ash. The top part of the profile is dacitic lahar materials. (Druif, 1932)
Lau Selaoen, lahar flows created the black dust soils underlying dacitic materials.

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