Sandstone is defined as a rock which is composed of sand-sized grains of various minerals mostly of uniform size and often are smooth and rounded. Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.
The Bronze Age Timeline. Timeline Description: The Bronze Age was a period of time between the Stone Age and the Iron Age when bronze was used widely to make tools, weapons, and other implements. Bronze is made when copper is heated and mixed with tin, creating a stronger metal than copper.
The use of copper in ancient China goes back to 3,000 BC. Although bronze artifacts were exhumed in the archeological sites of Majiayao culture (2700-2300 BC), it is still widely believed that China's Bronze Age began from around 2100 BC during the Xia dynasty.