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Despite the diversity and wealth of manuscripts from ancient and medieval India that have survived into the modern times, there is a paucity of historical data in them. Neither the author name nor the year of their composition were recorded or preserved, over the centuries, as the documents were copied from one generation to another. This paucity tempted 19th-century scholars to use the Puranas as a source of chronological and historical information about India or Hinduism. This effort was, after some effort, either summarily rejected by some scholars, or become controversial, because the Puranas include fables and fiction, and the information within and across the Puranas was found to be inconsistent.
In early 20th-century, some regional records were found to be more consistent, such as for the Hindu dynasties in Telangana, Andhra Pradesh. Basham, as well as Kosambi, have questioned whether lack of inconsistency is sufficient proof of reliability and historicity. More recent scholarship has attempted to, with limited success, states Ludo Rocher, use the Puranas for historical information in combination with independent corroborating evidence, such as "epigraphy, archaeology, Buddhist literature, Jaina literature, non-Puranic literature, Islamic records, and records preserved outside India by travelers to or from India in medieval times such as in China, Myanmar and Indonesia".
http://ancientvoice.wikidot.com/purana-and-itihasa