Geology

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.