Dg. Jenkins et al., THE FLIMSTON CLAY, PEMBROKESHIRE, WALES - A PROBABLE LATE OLIGOCENE LACUSTRINE DEPOSIT, Journal of micropalaeontology, 14, 1995, pp. 66-66
Samples from the Flimston Clay have yielded 30 specimens of pollen and
spores. The presence of five identified genera of pollen and spores i
ndicates a probable late Oligocene age.