It has long been recognised that the post-glacial (25-ft.) raised-beach of north-east Ireland contains, in addition to flint implements of Early Neolithic age and aspect, artefacts of Lower Palaeolithic forms. The presence of these early types within this beach may be accounted for as:—
1. A recrudescence of earlier forms during Early Neolithic times;
2. Lower Palaeolithic artefacts which have been derived from the glacial and inter-glacial drifts of the locality:
3. A mixture embraced by categories 1 and 2.
The evidence for the determination of this question must be sought outside the beach itself owing to the masking of the surface variations of the specimens through the deposition of a creamy-white patination and through marine attrition, though, regarding the latter, it should be mentioned that glacial striae have been observed upon certain of the implements recovered from the post-glacial (25-ft.) raised-beach at Kilroot.