The meso- and palynofloras recovered from sedimentary Units IV to VI in Hole 1138A on the CKP are useful in reconstructing the vegetational cover on land and are utilized for stratigraphic interpretations.
The sporomorph flora of Cores 183-1138A-71R through 73R reflects a dense conifer forest with many ferns in the understory and rare angiosperms. During the time interval represented, this vegetation cover did not change significantly. The sporomorphs show several spikes in the cored interval, but no major trends are seen. We interpret this pattern as signs of some kind of cyclicity, probably Milankovitch-type cycles.
According to sporomorph zonation schemes developed in the Australian realm, the age of the interval is most probably latest Albian, possibly earliest Cenomanian.
The marine dinocyst floras recovered in Cores 183-1138A-67R through 69R suggest age ranges from the late Cenomanian to the mid-Coniacian, which is in agreement with other microfossil data.