| Abstract: |
Mid Tertiary palynological assemblages from fourteen stratigraphic sequences in nine basins in Thailand have been investigated. Special emphasis has been given to the spore-pollen record and its stratigraphic distribution. The basis for defining the zonations is the first or last appearance of key species including: _Inaperturopollenites dubius_, _Alnipollenites verus_ and _Echiperiporites_ cf. _E. estelae_. For the first time, correlation between terrestrial and dated marine sequences is achieved. Two palynological zones (SIAM-1 and SIAM-2) have been constructed. SIAM-1 Zone is characterized by, inter alia, assemblages comprising high frequencies of gymnosporous pollen, and is provisionally correlated with the planktonic foraminiferal N3-N4 zones of the Trang-1 Borehole, Andaman Sea, indicating an Upper Ogliocene to early Lower Miocene age. SIAM-2 Zone is characterized by influxes of tropical taxa and decreasing proportions of the temperate taxa and is provisionally correlated with planktatonic foraminiferal N5-N8 zones of the Mergui-1 Borehole, Andaman Sea, indicating a middle to late Lower Miocene age. The results show that the Nong Ya Plong Basin coal seam (pre SIAM-1) is older than the Li Basin coal seams (SIAM-1), Fang Basin oil-bearing intervals (SIAM-2) and Mae Moh Basin coal seams (pre SIAM-2).
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