Fig. 5. Selected photographs of the coal-bearing deposits in Eastern Kalimantan (Barito Basin, Asem-Asem Basin and Kutai Basin) during the coal exploration projects. (a) Tanjung Formation (Tet-9). (b) Warukin Formation (Tmw-1). (c and d) Montalat Formation (Tomm-1). (e) Pulaubalang Formation. (f) Balikpapan Formation. (g and h) Kampungbaru Formation. Note the weakly coalified (lignite rank) coal sample. (i) An example of core logging sheet of the Tanjung Formation (Tet-6).

Econ. Environ. Geol. 2022;55:149-69 https://doi.org/10.9719/EEG.2022.55.2.149

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