The Vasihnva Puranas are Vishnu Purana, Naradiya Purana, Vamana Purana, Matsya Purana, Garuda Purana, and Shrimat Bhagavata Purana.
Bhavishya Purana is the Purana in which Brahma , having described the greatness of the sun , explained to Manu the existence of the world , and the characters of all created things, in the course of the Aghora Kalpa , the stories being for the most part of the events of a future period. It contains fourteen thousand five hundred stanzas. This Purana, as the name implies should be a book of prophesies , foretelling what will be ( bhavishyat ), as the Matsya Purana intimates.
The 18 Mahapuranas (great Puranas), as the origins of the Puranas, may have overlapped to some extent with the Vedas , but their composition stretched forward into the 4th-5th centuries,... the earliest parts of the Puranic genealogies are either entirely or partly w:Mythicalmythical. The oldest of the Puranas are the Matsya, Vayu and the Brahmanda and for our purposes, the Vishnu Purana, somewhat later than the first three ... the Vedic link also goes back to the earlier statement that the itihasa-purana was the fifth Veda.