Kalpa described in Bhaviṣyapurāna (Bhavishyapurana). Bhaviṣyapurāna describes the time when Brahmā, following Ādityamahātma (Adityamahatma), imparts to Manu wisdom regarding the manifestations of the world and its inhabitants during the aghorakalpa.

Matsyapurāṇa(53.30–31)