The wingspan is 40–45 mm. Their forewings are light grey on the front edge, the inner portion of the wing is cinnamon-brown. In the grey area is a roundish dark grey stain shaped like a pebble bounded proximally by a dark curved line. There is a dark, curved postmedian line towards the apex of the wing. The hindwings are grey, darker grey in the females. They have a dark, discal lunule. The thorax and abdomen are dark brown and thickly clothed with hair. The moth flies from April to September depending on the location.
- South R. (1907) The Moths of the British Isles, (First Series), Frederick Warne & Co. Ltd., London & NY: 359 pp. online
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- Pebble prominent on UKmoths
- Fauna Europaea
- Lepidoptera of Belgium
- Vlindernet.nl (in Dutch)