bleeding sandstones
In the Carboniferous rocks (Bude formation) that make up the cliffs of Hartland Point, North Devon, there are bands of sandstone that appear to bleed. Not actual liquid but a blood coloured staining. Seemingly not algal, and not removable by scratching at it. Looks like it has dribbled out, usually along creases and folds or stratification planes. But also dripped onto pebbles.
Easily overlooked in the dry, the colours are intense when wet.
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