The standardized timescale for the planet Mercury.
Period
Epoch
Dates (Ma ago)
Pretolstojan
4568–3900
Tolstojan
3900–3850
Calorian
3850–3000
Early Calorian
3850–3800
Late Calorian
3800–3000
Mansurian
3000–1000
Kuiperian
1000–0
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。