According to B. B. Lal, former DG of ASI, Kalibangan site shows that an earthquake occured around 2600 BC, which brought to an end the Early Indus settlement at the site. It is perhaps the earliest archaeologically recorded earthquake.
The land during the Gupta period can be classified into the following groups:Kshetra: Cultivable landKhila: Waste landAprahata: Jungle or forest landVasti: Habitable landGapata Sarah: Pasture land
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