Yuga-Vibhāga and Kāla-Pramāṇa
Measures of Time and the Four Yugas
इति श्रीब्रह्माण्डे महापुराणे वायुप्रोक्ते पूर्वभागे द्वितीये ऽनुषङ्गपादे अमावस्याश्राद्धे पितृविचयोनामाष्टाविंशति तमो ऽध्यायः ऋषिरुवाच चतुर्युगानि यान्यासन्पूर्वं स्वायंभुवे ऽन्तरे / तेषां निसर्गं तत्त्वं च श्रोतुमिच्छामि विस्तरात्
iti śrībrahmāṇḍe mahāpurāṇe vāyuprokte pūrvabhāge dvitīye 'nuṣaṅgapāde amāvasyāśrāddhe pitṛvicayonāmāṣṭāviṃśati tamo 'dhyāyaḥ ṛṣiruvāca caturyugāni yānyāsanpūrvaṃ svāyaṃbhuve 'ntare / teṣāṃ nisargaṃ tattvaṃ ca śrotumicchāmi vistarāt
Thus in the Śrī Brahmāṇḍa Mahāpurāṇa, in the former section spoken by Vāyu, in the second Anuṣaṅga-pāda, in the account of the Amāvasyā śrāddha, the twenty-eighth chapter called “Pitṛvicaya”. The ṛṣi said: The four-yuga cycles that existed earlier in the Svāyambhuva Manvantara—their arising and their true principle I wish to hear in detail.