The Rimba Raya Biodiversity Reserve REDD Project
The Rimba Raya Biodiversity Reserve REDD Project
The Rimba Raya Biodiversity Reserve REDD Project
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containing marine organic matter. Silt and mud are bright grey,sometimes bedded, containing organic matter, and depositedunderneath coarse-‐grained sands. This unit is found only in thePembuang River mouth area, suggesting a progressing deltasequence influenced by wave activity. This unit occasionallymixes with other surface deposits.(i) Deltic Deposits -‐ Qad. Holocene. Coarse-‐ to fine-‐grainedsands, silts, and mud. This unit is found only in the PembuangRiver mouth area to the north and outside the project area.(ii) Undifferentiated Clastic Deposits – Qau. Holocene. Sands,silt, clay, mud, and peat. Unbedded coarse-‐ to fine-‐grained sands,bright brown in color, mainly composed of quartz, feldspar, andbiotite, but locally containing conglomerates. Silts areunconsolidated, bright grey in color, and unbedded. Grey clayand mud are very elastic, and the peat is dark brown. In manyplaces this unit is very similar to the other superficial desposits.(iii) River Deposits – Qas. Holocene. Cobble/pebble, sand, silt,clay, and mud containing debris of terrestrial organic matter.Cobble/pebble and sand mostly unconsolidated, composed ofrock fragments (sandstone/coal/quartz) and organic matter.Silt/clay and mud found mostly in the river mouth area, mixedwith tiny plant matter. Lineaments orientated semi-‐parallel tothe main river course indicate the influence of the river flooding.(v) Pembuang Formation – QTp. Late Pleistocene.Carbonaceous sandstone, conglomerate, siltstone, claystone, andpeat. Coarse-‐ to medium-‐grained sandstone mostly composed ofquartz, K Feldspar, biotite, and carbon-‐rich matter. Polimicteousconglomerate, chiefly composed of quartz, calcite and sandstone.Semi-‐consolidated sandstone ranging from fine-‐ to medium-grainedsize. Grey siltstone and claystone showing well beddedstructures. Brown peat attends to 50 cm thick. <strong>The</strong> C14 dating ofthe uppermost part of the formation indicates an age of c. 45,000years (Late Pleistocene). This formation was deposited in theprogressing delta environment, and included at least threeperiods of stratigraphic sequence. A type location is suggested inthe right corner bank of the Pembuang River upstream andclose/opposite to Kampung Jahitan, or 03 01' S 112 17' E.(vi) Dahor – TQd. Middle Miocene-‐Plio Plistocene.Conglomerate, sandstone, and alternation of claystone-containinglignite layer with paralic environment, thickness up toapproximately 500 m, no fossil; can be correlated with the Dahorformation in Palangkaraya quadrangle.(iv) Swamp Deposits – Qs. Quaternary. Peats, kaolinitic clay, siltwith intercalation of sand, and plant remains.9
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