One of our great epics "Bhagavat Purana" describes an endless cycle of great four yugas ages / era / epoch.
Satya Yuga or the Age of Truth is said to last for 12,000 divine years (43,20,000 human years), Treta Yuga for divine years 3,600 (12,96,000 human years), Dwapara Yuga for 2,400 divine years (8,64,000 human years) and Kali Yuga will last for 1,200 divine years (4,32,000 human years). We believe the process of creation moves in cycles and that each cycle has four great yugas, or epochs, of time.
* Arts Crafts & Sciences created (eg laws, agriculture, kings, craftsmen, trade, travel)
* Agriculture and the process involved in the crop raising or animal rearing, the yield and bi products of agriculture is very evidently seen from early eras starting from Treta Yuga.
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