Abstract
Synopsis The Lower Old Red Sandstone exposed on the coast near New Aberdour can be divided into a lower sandstone and conglomerate formation and an upper sandy mudstone formation which contains several sandstone lenses in its upper part. The lower formation can be further subdivided into four lithofacies assemblages (Facies 1A to 1D) consisting of, respectively, debris flow conglomerates, stream channel deposits, proximal alluvial fan deposits, and distal fan/sandflat deposits. Facies 2A of Formation 2 consists of a mud flat (playa) facies, containing evidence for pedogenesis (calcretization), and bioturbation, whereas Facies 2B, the sandstone lenses, reflect a return to higher energy, probably alluvial fan, deposition. The sediments were laid down in a small fault-bounded basin. The influence of tectonic activity and fan sedimentary processes are reflected in fining upwards ‘megasequences’ and ‘sequences’ respectively. Periods during which some fan segments and the adjacent playa received little sediment are reflected in the occurrence of numerous calcrete layers in the mudflat/playa facies.
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