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Author - title
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| details | Middle Oligocene | Early Miocene | Wales(Caernarvonshire) | Herbert-Smith,M. The age of the Tertiary deposits of the Llanderdr (Mochras Farm) Borehole as determined from palynological studies. (In: The Llanbedr (Mochras Farm) Borehole. W.Woodland, editor) | 1979 |
| details | Chattian | Wales(Pembrokeshire) | Jenkins,D.G. et al. The Flimston Clay, Pembrokeshire, Wales: A probable Late Oligocene lacustrine deposit | 1995 |