Only one sample from this site barely captures the pa-
leoenvironmental signal of the basin, but previous palyno-
logical assemblages from the Oligocene of Thailand pro-
vide information to assess the relevance of our sample. As-
semblages from the Upper Oligocene to Mid Miocene of
Nong Ya Plong have yielded pollen grains such as Alnipol-
lenites verus (Alnus-like), Caryapollenites simplex (Carya-
like), Faguspollenites sp. (Fagus-like), which “have affini-
ties with modern pollen of temperate regions” (Watanasak,
1990). Other pollen records from the Oligocene of northern
Thailand (Li Basin) also suggest a warm temperate vegeta-
tion (Songtham et al., 2003, 2005). These data compare well
with our sample and gives credits to the presence of a tem-
perate vegetation between 26 and 24 Ma in Thailand.