Large boulders have fallen onto the beach at Rhossili from Rhossili Down which towers above it; and they lie at the foot of the low platform or terrace of loose material that runs along the length of the Down. The boulders are mainly quartz conglomerate from the Old Devonian Red Sandstone strata of which the Down is mostly made.
These conglomerates are composed of roughly rounded white or pink vein quartz pebbles upto 10 cm in diameter, with minor amounts of jasper, quartzite and lithic fragments. Occasionally there is evidence of cross-stratification and graded bedding.
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