Nikon F70, Tamron 28-80mm f3.5-5.6, Kodak Elitechrome 200

At dusk one night, we saw this mist crawling up the valley outside the cottage, oozing its way upwards. Naturally, I ran out with my camera and tripod, knocking over everyone else in the process. Apparently, the chap in the cottage next door explained, this mist is seen over areas of solid clay, where there is likely to be coal seams - this was how early coal miners would find a promising area to dig, by looking out for these mists after rainfall!