Fennian age

471.1 - 468.4 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 top and bottom ages have 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 7 timescales which overlap this one. show

This interval is used in the definition of 20 collections

A total of 379 collections with 1797 occurrences lie within this time span

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International Chronostratigraphic TimescaleOrdovician of BritainOrdovician of North America
OrdovicianLate OrdovicianHirnantianAshgillHirnantianCincinnatianGamachian443.8
KatianRawtheyan445.2
Richmondian446 *
Cautleyan448.9 *
Pusgillian449.3 *
CaradocStreffordianOnnian †449.6 *
MaysvillianRocklandian †/Shermanian/Ashbyan/Kirkfieldian/Blackriveran/Wildernessian/Trentonian/Franklinian449.8 *
Edenian450.4 *
MohawkianChatfieldian451.1 *
Cheneyan451.5 *
Burrellian452.7 *
Sandbian453
Actonian †453.2 *
Turinian453.7 *
Marshbrookian †Woolstonian †454.2 *
Longvillian †455.2 *
Aurelucian456.8 *
WhiterockianCanadian †Chazyan †/Marmor457 *
Soudleyan †/Harnagian/Costonian457.4 *
Middle OrdovicianDarriwilianLlanvirnLlandeilian/Llandeilo/Late Llandeilo/Middle Llandeilo/Early Llandeilo/Late Llanvirn458.4
Abereiddian/Early Llanvirn461.3 *
Dapingian467.3
ArenigFennian468.4 *
Rangerian469.1 *
Early OrdovicianFloianIbexianBlackhillsianJeffersonian †Cassinian †470
Whitlandian471.1 *
Tulean473.9 *
Moridunian474.3 *
TremadocianTremadocMigneintian477.7
Stairsian480.3 *
Cressagian480.8 *
Skullrockian/Demingian482 *
485 *
485.4
487.5