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.
Weston Association is extensive in bays and estuaries:
the west coast, there are major developments in the Padas delta and around
the east coast, the association is almost continuous from the Bengkoka
Peninsula to the Dent Peninsula with major developments in Schomburgk Bay,
Labuk Bay, Sandakan Harbour and in the deltas of the Kinabatangan and the
the southeast, it is particularly extensive in Cowie Harbour.
association is formed in tidal swamps with 3 distinctive landforms, namely tidal
flats, 'crab' mounds and platforms formed of coalescent 'crab' mounds. Parent
materials consist of mainly fine-textured sulphidic alluvium and peat. The
natural vegetation comprises forests of mangroves and nipah palm (Nypa
natural vegetation, which covers the whole association, comprises forests of
mangroves and nipah palm Nypa fruticans. Rhizophora mucronata,
Rhizophora apiculata, Bruguiera parviflora and Excoelania agallacha occur
in tidal flats. Somewhat drier sites on low crabs mounds support Ceriops
tagal, Xylocarpus granatium and Avicenia alba with the piah
fern Acrosticum aureum on the summits of the mounds.