Fossil oak or Ebony (Bog-oak) is the natural oak tree which has been in the water and mud of riverbeds from several hundred to several thousand years. Because of the chemical process and under the influence of running water, Ebony got dark brown, gray and black color, as well as excellent strength and hardness, and specific gravity, so it is rightly called, ’eternal tree’.
In Serbia, especially in Sumadija, there aren’t any large walnut forests or plantations. There are walnut trees planted in small areas or individual self-sown trees. The quality, strength, hardness, completely unique texture and color of this wood have classified it among the most expensive kinds in the world.
Oak (Quercus) has about two hundred species. The most famous is the English oak (Quercus robur), which is traditionally used as a timber of high strength and hardness, high performance, unique textures and colors.