White Sea Assemblage
~560 – ~550 Ma [1] PreꞒ Ꞓ O S D C P T J K Pg N
Kimberella fossil from the Ustʹ Pinega Formation near the White Sea in Russia.
Chronology
−575 — – −570 — – −565 — – −560 — – −555 — – −550 — – −545 — – −540 — – N e o p r o t e r o z o i c P Z Ediacaran Cambrian         Avalon Assemblage White Sea Assemblage Nama Assemblage ← Second pulse of the end-Ediacaran extinction ← ~ Baykonurian glaciation ← First pulse of the end-Ediacaran extinction ← Avalon Explosion ← Shuram excursion reaches its peak   Major Glacial period   Shuram excursion [2] Stratigraphic scale of the ICS subdivisions and Ediacaran biotic assmblages Vertical axis scale: millions of years ago

The White Sea assemblage was the second of the three Late Ediacaran biotic assemblages, following the Avalon assemblage and preceding the Nama assemblage. It spanned from c. 560 Ma to c. 550 Ma. Showing an increase in genus diversity from the Avalon assemblage, it concluded with a faunal turnover often characterized as the first pulse of the end-Ediacaran extinction, with only 20% of White Sea taxa found in the later Nama assemblage despite similar taphonomic processes. ^{[3] [4]}

References

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