A stage (196.5–189.6 Ma ago) in the European Early Jurassic, preceded by the Hettangian, followed by the Pliensbachian, and contemporaneous with the upper Aratauran (New Zealand). See also lias.
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。