95 bin Phanerozoic time scale based on the stratigraphic stages of Gradstein et al. 2020.

Stage-level (age-level) timescale used in some analyses.

Usage

data(stages)

Format

A data.frame with 95 observations and 10 variables:

sys

Abbreviations of geologic systems.

system

Geologic periods.

series

Geologic series.

stage

Names of geologic stages.

short

Abbreviations of geologic stages.

bottom

Numeric ages of the bottoms boundaries (earliest ages) of the bins.

mid

Numeric age midpoints of the bins, the averages of bottom and top.

top

Numeric ages of the tops (latest ages) of the bins.

dur

Numeric ages of the durations for the bins.

stg

Integer number identifiers of the bins.

systemCol

Hexadecimal color code of the systems.

seriesCol

Hexadecimal color code of the series.

col

Hexadecimal color code of the stages.

Source

Based on Gradstein et al. (2020).

Details

This is an example time scale object that can be used in the Phanerozoic-scale analyses. Example occurrence datasets related to the package use the variable stg when referring to this timescale. This version uses the longer Rhaetian option.

References

Gradstein, F. M., Ogg, J. G., & Schmitz, M. D. (2020). The geologic time scale 2020. Elsevier.