What time in the past does "prehistoric" refer to?

It refers to the age of the dinosuars the prehistoric era

Answer erosion,oil spills,pollution,tourism,urban development;

The zhou dynasty (1046-256 bce) was the longest-lasting of china's dynasties. it followed the shang dynasty (c. 1600-1046 bce) and it finished when the army of the state of qin captured the city of chengzhou in 256 bce.