INDONESIAN JOURNAL ON GEOSCIENCE Geological Agency
and siltstones and inter-bedded quartz sand-stones. This formation was deposited in flood plains. 4. Sawahtambang Formation consists of a thick massive sequence of cross-bedded sandstones, which typically quartzose to feldspathic. 5. Ombilin Formation comprises dark grey car-bonaceous and calcareous shales. Materials and Methods Materials
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