Microliths of crystalline stone and petrified wood from about 1250–1000 BC are found in many places in the Ajay-Kunur-Kopai river system.
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The local name of a sickle-shaped curve in the river inspired the title of the novel Hansuli Banker Upakatha (Story of the Sickle-shaped Curve) by Tarashankar Bandopadhyay, made into a film by Tapan Sinha.
During his tenure with the Archaeological Survey of India (ASI) Rajendra identified a 230 X 135 m site at Mahisdal located on the left bank of the Kopai River in Birbhum District of West Bengal for archaeological excavation.
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Microliths of crystalline stone and petrified wood from about 1250–1000 BC are found in many places in the Ajay-Kunur-Kopai river system.