A regional stage (142–136.5 Ma ago) in the British Early Cretaceous, preceded by the Volgian and overlapping with the Valanginian (140.2–136.4 ma ago). It is roughly of Berriasian age and contains the uppermost Purbeck Beds.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。