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Fig. 1. Simplified geological map of Sumatra, showing the distribution of the Woyla Group and correlated units, with localities mentioned in the text.
Fig. 2. The distribution of the Woyla Group in Aceh. For explanation see text. Modified from Stephenson and Aspden (1982), with data from Bennett et al.(1981a, b) and Cameron et al
Fig. 3. The distribution of the Woyla Group in the Natal area, North Sumatra. Modified from Rock et al
Fig. 4. Geological map of the Batang Natal river section, North Sumatra. Inset shows isotopic dates (from Wajzer et al., 1991)
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