Rhossili beach boulders (2)

This post presents photographs of three different Old Red Devonian Sandstone boulders on the beach at Rhossili, with separate close-up images of their texture, showing that the composition varies within individual boulders, with gradations of texture from fine to coarse constituents and stratifications known as graded bedding.

The quartz conglomerate rock strata of the Upper Old Red Sandstone (UORS) – characterised by their undivided red and white stones in a sandstone matrix – were deposited on top of the Brownstones (BRS) which are brown sandstones with thin mudstones and conglomerates. These in turn were deposited on the Lower Old Red Sandstone (LORS) comprising undivided red mudstone.

What we see in these photographs could be a range of the intermediary rock types from the Upper conglomerates to the Lower brownstones. I need to investigate further to understand what they represent. There’s always something more to learn and understand.