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- TemporalReferenceSystem
- This package is an extension of ISO19108 Temporal Schema
- TimeOrdinalEra
- The association of an era with a stratotype is optional. In the GSSP approach recommended by ICS for the Global Geologic Timescale, Unit Stratotypes are not used. Rather, the association of an Era with geologic units and sections is indirect, via the association of an era with Boundaries, which are in turn tied to Stratotype Points, which occur within host Stratotype Sections.
Note that the "German School" defines stratigraphic eras conceptually, without reference to stratotypes.
- TimeOrdinalEraBoundary
- A point in Earth's history which bounds a TimeOrdinalEra.
- TimeOrdinalReferenceSystem
- A time reference system comprised of an ordered set of time periods (time ordinal eras).
- TimeScale
- The Timescale package describes geologic time periods (geochronologic eras) and the boundaries between them.