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Neocomian The earliest Cretaceous epoch, followed by the Barremian Age. It is dated at 145.6–131.8 Ma ( Harland et al., 1989) and comprises the Berriasian, Valanginian, and Hauterivian Ages. Some authors restrict their use of Neocomian to just the Berriasian and Valanginian, whilst others extend it to include the Barremian and Aptian.