Age · Early Ordovician
Tremadocian
487–477 Ma
The Tremadocian is an age within the Early Ordovician, spanning roughly 487 to 477 million years ago.
| Rank | age· Macrostrat |
|---|---|
| Base | 487 Ma· Macrostrat |
| Top | 477 Ma· Macrostrat |
| Duration | 9.75 Myr· Macrostrat |
| Chart | ICS International Chronostratigraphic Chart v2023/09 (ages from Macrostrat/PBDB interval tables) |
Elsewhere
- Macrostrat: 121
- PBDB: 559
- ICS chart (stratigraphy.org)
- Wikipedia: Tremadocian
Cite this article
Stratum Study. "Tremadocian" (Time interval). Stratum Study pack 2026.09, as of 2026-09-19. https://stratum.black/study/time/tremadocian. Accessed 2026-09-20.
@misc{stratum-tremadocian,
title = {Tremadocian},
author = {{Stratum Study}},
howpublished = {\url{https://stratum.black/study/time/tremadocian}},
year = {2026},
note = {Time interval article, Stratum Study pack 2026.09, as of 2026-09-19; sources: stratum, macrostrat, pbdb. Accessed 2026-09-20.}
} Citations carry the pack version and the article's as-of date so they resolve to the same text later. The facts themselves belong to the sources listed below; cite those for the science.