The ICS international chronostratigraphic chart (v2022/2).
Format
A data.frame with 5 variables:
- type
Unit type ("
eon", "era", "period", "series" or "stage"). Precambrian and Hadean are informal units.- name
Unit name.
- age
Numerical age (Ma).
- error
Error on numerical age (Ma).
- parent
Parent unit.
References
Cohen, K. M., Finney, S. C., Gibbard, P. L. and Fan, J.-X. (2013). The ICS International Chronostratigraphic Chart. Episodes, 36(3): 199-204. doi:10.18814/epiiugs/2013/v36i3/002