All information on soils were from the Land Resource Study 20 series of books
(Volumes 1 to 5), published by the Land Resources Division, Ministry of Overseas
Development , UK.
Bidu Bidu Association is the only association mapped on ultrabasic igneous
rocks. The Tawai and Binalik Associations, which also have soils formed on
parent materials derived from ultrabasic igneous rocks, have been described
elsewhere in this web.
Bidu Association (41)
Bidu Bidu Association occurs on mountains and hills of ultrabasic igneous rocks.
to the east and west of Mt Kinabalu,
the Meliau Range,
Bidu Bidu Hills,
peaks in the headwaters of the Segama (for e.g. Mt Danum and Mt. Nicola),
and on the watershed of the Segama and the Kinabatangan.
association also includes areas of low hills notably in the lower Labuk valley
and sporadically in the Kinabatangan lowlands.