Limestone is a pale grey rock – or is it always? At times the strata can be tinted by the inclusion of iron compounds to shades of red, orange, and yellow. At other times, it can be coated green or purple by encrusting algae; or encrusted black and yellow by lichens.
From a distance, or to the casual eye, the jagged rocky outcrop of the Causeway that connects Worms Head to the southern headland of Rhossili Bay, on the Gower Peninsula, may seem a dark and monotonous expanse. A keen eye will note, however, brightly coloured patches, especially in and around tide pools, where natural shades of stone harmonise with hues of living seaweeds and seashore creatures.
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