The transition from the Bronze to the IronAge was always problematic for Russianarcheologists, because they were including such an enormous among of territory and so many different ethnic groups. Because different peoples worked with these metals at different times, and there was a relative paucity of iron in certain areas, such as the Caucasus, it was impossilbe to establish a timeline for “Russia.” The Scythians, for example, also fall into the Iron Age because so much of this metal was found in their kurgans.