Padma Purana’s Srishti Khanda explains ‘The Beginning of Creation’. The beginning of the creation was narrated by Suta to Bhishma..
The Sages requested Suta to narrate about the incident when sage Pulastya had met Bhishma. Suta replied— Bhishma was doing penance at a place called Gangadwar. Being pleased by his austere penance, Lord Brahma instructed Pulastya to go to Gangadwar and bless Bhishma.
After reaching there, Pulastya told Bhishma that Lord Brahma was pleased by his penance. ‘Ask any boon you wish for’ said Pulastya. Bhishma thanked his good fortune of getting a chance to meet Sage Pulastya. He requested Pulastya to reveal how Lord Brahma had created the world.
Pulastya replied— During the initial phase of his creation, Lord Brahma created the Mahattatva first of all. After that he created the three types of Ego from the Mahattatva—Satva, Rajas and Tamas. These three types of Ego are the origins of all the five sense-organs, organs of action and all the five basic elements–space, water, fire, air and earth.
An enormous egg came into existence with the permutation and combination of these five basic elements. Within this egg exists the whole universe including the mountains, islands, oceans, planets, deities, demons and the human beings. The layers of water, fire, air, space and darkness envelop this enormous egg. These elements are once again covered by the ‘Mahattatva’, which in turn is enveloped by the ‘Prakriti’ (nature). Lord Vishnu himself does creation in the form of Lord Brahma and also takes various incarnations to protect the mankind. At the end of the Kalpa, it is only He, who annihilates in the form of Rudra. After the end of Kalpa, he takes rest on the back of Sheshnag for the full period of deluge.