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- a natural (undressed) stone, often river washed, used as a surfacing material. Can vary in size from a few inches to over a foot. The best surfaces are made of egg-shaped stones, set point end downwards in sand and packed tightly together. The points bed into the sand like the roots of teeth, and make an almost indestructable surface. Cobbles laid flat wobble and work loose. "Horonizing" is the use of stone off cuts as a surfacing material in the same way as cobbles. While quite large areas can be covered in this way, the material is more often used at small, awkward junctions for example at the foot of walls.