त्रेतायुग
The Treta-yuga is the second of the four ages. At SB 3.11.18 it is named after Krita, and at SB 3.11.19 its length is given as three thousand years, with the hundreds doubled. For the ages after Krita, SB 3.11.21 says: 'sa evAnyeShv adharmeNa vyeti pAdena vardhate' — that same dharma, in the others, wanes by a foot through unrighteousness and grows again.
Śrīmad Bhāgavata Mahāpurāṇa 3.11.18 — Sanskrit Wikisource (pinned chapter page; Devanagari from the cross-validated transcription in validation/sanskrit_skandha3.json)
At SB 3.11.18-19 Treta is named after Krita and its length is given as three thousand years, with the hundreds doubled. At SB 3.11.21 the waning and growth of dharma by a foot in the other ages is described.
