A dominance of spores attributed to cyatheaceous and other fern taxa indicates that tree ferns and other pteridophytes were a major component of the vegetation throughout the environments represented by the section, despite the absence of ferns in the megafossil record. Nypa and mangrove megaremains together with mangrove pollen and Acrostichum spores attest to the presence of a mangrove community similar in composition to those of modern Southeast Asia. Palms and megathermal tree taxa such as those belonging to the Malvaceae, Meliaceae, Alangiaceae, Anacardiaceae and Pellicieraceae inhabited the interfluve and swamp forests. Perennial herbs of the family Gunneraceae occur throughout the section.
Palynofacies analysis shows a dominance of anoxic/dysoxic environments with a small part of the lower part of the section exhibiting more oxic conditions associated with circumstantial evidence for mild marine, possibly tidal, influence. Most palynodebris fluoresce only weakly consistent with the relatively high rank for coals of this age. A small number of reworked Gondwanic (Permian) grains suggest sediment erosion from the highlands to the north.
The late Oligocene tropical delta vegetation has much in common with modern lowland wet megathermal forests from Southeast Asia. However tree ferns appear more prevalent in the late Oligocene.