Moscow has a history of chaotic periods of war that ended with the destruction of a once largely wooden city and the building of a "new" city on top of the rubble of the old. The result is a layered city, with each tier holding information about a part of Russias past. In some areas of the city, archaeologists have reached the layer from 1147, the year of Moscows founding. Among the findings from the various periods of Moscows history are carved bones, metal tools, pottery, glass, jewelry, and crosses.
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From the passage, the reader can infer that