This chapter discusses the formations of the Tanjong Group. A number of circular basins occur on a SW line from Sandakan to the Meliau Basin, then through the Malibau Basin into the Tarakan Basin of Kalimantan. They are sedimented in the Middle Miocene by quartz-rich material derived from erosion of the uplifting Western Cordillera, as well as volcaniclastic material from the Semporna Volcanic Arc. The strata are ascribed to the Tanjong Formation and the basins occupy the landward extension of the SE Sulu Sea Rift. The basin margins have steep dips, while the basin centres are flat-lying. The formation described here are: Sandakan formation, Bongaya Formation Basin, Kudat Formation, and the Bukit Garam Basin Tanjong Formation. The lithologies, palaeontology and age, fission track and reflectivity studies, and paleogeography of these formations are also summarized. The varieties and possible origin of circular geological structures are also reviewed. The structural development, stratigraphy, lithologies, paleoocurrents and paleooenvironment, paleontology and age, and chronostratigraphy of the Tanjong Formation are also discussed.
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