Tremadoc epoch
485 - 477.7 Ma
The definition of this interval in the timescale Ordovician of Britain is taken from the following source:
- F. M. Gradstein, J. G. Ogg, M. D. Schmitz and G. M. Ogg. 2020. Geologic Time Scale 2020 view
The bottom age has been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.
There are intervals in 8 timescales which overlap this one. show
This interval is used in the definition of 831 collections
A total of 1696 collections with 7840 occurrences lie within this time span
International Chronostratigraphic Timescale | Ordovician of Britain | ||||||
---|---|---|---|---|---|---|---|
Ordovician | Late Ordovician | Hirnantian | Ashgill | Hirnantian | 443.8 | ||
Katian | Rawtheyan | 445.2 | |||||
Cautleyan | 448.9 * | ||||||
Pusgillian | 449.3 * | ||||||
Caradoc | Streffordian | Onnian † | 449.6 * | ||||
Cheneyan | 451.5 * | ||||||
Burrellian | 452.7 * | ||||||
Sandbian | 453 | ||||||
Actonian † | 453.2 * | ||||||
Marshbrookian † | Woolstonian † | 454.2 * | |||||
Longvillian † | 455.2 * | ||||||
Aurelucian | 456.8 * | ||||||
Soudleyan †/Harnagian/Costonian | 457.4 * | ||||||
Middle Ordovician | Darriwilian | Llanvirn | Llandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn | 458.4 | |||
Abereiddian/Early Llanvirn | 461.3 * | ||||||
Dapingian | 467.3 | ||||||
Arenig | Fennian | 468.4 * | |||||
Early Ordovician | Floian | 470 | |||||
Whitlandian | 471.1 * | ||||||
Moridunian | 474.3 * | ||||||
Tremadocian | Tremadoc | Migneintian | 477.7 | ||||
Cressagian | 480.8 * | ||||||
485 * |