Markandeyapurana 59.1

59.1

mārkaṇḍeya uvāca
evantu bhārataṃ varṣaṃ yathāvat kathitaṃ mune /
kṛtaṃ tretā dvāparañca tathāthiṣyaṃ catuṣṭayam //

Mārkaṇḍeya spoke:
Thus then have I declared this continent Bhārata accurately, O muni, and the Kṛta, Tretā, and Dvāpara, and Kali ages which are the four ages.[1] And now indeed there is a fourfold classification[2] in these ages, O brāhman. Four, three and two hundreds and one hundred of autumns men live here in the Kṛta, Tretā and two other ages respectively, O brāhman.