Slide 21: Pollen evidence?
There is some evidence to support this theory, despite the difficulty in obtaining such evidence. Two key elements of the fynbos (the Restionaceae and Ericaceae) were well-represented in pollen records quite far north about 18000 years ago, and subsequently died out and are not apparent in the records after 15000 years ago. This indicates the retreat of the fynbos from this area, and the expansion of the succulent karoo biome into the vacated space.
Shi, N., Dupont, L.M., Beug, H.J., Schneider, R.R., 1998. Vegetation and climate changes during the last 21,000 years in south-west Africa based on a marine pollen record. Vegetation History and Archaeobotany 7, 127-140