The earliest Cretaceous age, followed by the Barremian Age. It is dated at 145.5–130 Ma (Int. Commission on Stratigraphy, 2004) 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.
Subjects: Earth Sciences and Geography.