The Chalcolithic period refers to the time period that preceded the Bronze Age. It was known for its predominant use of copper and stone tools.
For further reading check the following articles:
|The gist of Yojana||Government Exams|
|Comprehensive daily news analysis||UPSC FAQ|
|List Of NCERT books for UPSC Mains preparation||NCERT notes for History (Modern, Medieval, Ancient), Art and Culture, and Geography|