Vayupurana 1.58.120

Vāyupurāṇa 1.58.120

tathā kalpayugaiḥ sārddhaṃ bhavanti samalakṣaṇāḥ.
manvantarāṇāṃ sarveṣāmetadeva tu lakṣaṇam .. 58.118 ..