The Sinharaja Reserve lies within the
transition zone of two important groups of rock types, the south/western
group which consist of metasediments-charnokites and scapolites bering
calc granulites and the highland group comprising khondalites of
metamorphosed sediments and Charnockites. The most significant
geological feature of Sinharaja is the presence of a "Sinharaja Basic
Zone" which comprises hornblend pyriclasts, basic charnokites pyroxene
amphibolites and scapolite.
The soils of Sinharaja
largely belong to the group of Red Yellow Podzolic soils, with clearly
distinguishable horizons of varying soil depths. The soil is well
drained with very little accumulation of organic matter.
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