Ground-penetrating radar (GPR) was used to identify sediment units at the terminus of a small dune field at Aberffraw. Nine samples were taken from boreholes; sample locations were based on the stratigraphy established by GPR. Quartz grains were dated using a single aliquot regenerative dose protocol that allows for sensitivity changes. Sand deposition at Llyn Coron, Aberffraw, occurred three times in the last 700 years with initial sand movement occurring around 1331 AD, when historical documents record sand being mobilised in a strong storm. (C) 2000 Elsevier Science Ltd. All rights reserved.