These and some other problems ivolved in the C 14 dating make this method unsuitable for accurate land-sea correlations. A better reconstruction can be achieved by using contemporaneous changes in e.g. both dinoflagellate cysts and in pollen-associations from the same marine core. This is from 51.5 cm till 179-182 cm coredepth as dated by W. Austin. In the absence of a good lithological description, the resolution is calculated with a constant sedimentation rate. It has to be taken into account, that it is not certain that the sedimentation was continuous.
Pollen reflect the regional vegetation on land.
The regional vegetation patterns are influenced by the climate. The abundances of pollen can also be used. The pollen are transported by wind and the rivers to the place where they are deposited. Besides pollen, organic walled dinoflagellate cysts are also a good paleoclimatic indicator. In the dinoflagellate cyst assemblages both gonyaulacoid and peridinioid species can be found.