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.
Ancient China (from earliest times to 221 B.C.) 2000-1500. Earliest use of bronze technology (gradually superseded by iron technology after c. 500) Earliest bronze ritual vessels.