Ediacaran endlings from the Avalon Assemblage and the severity of the Kotlin Crisis: First documentation of the Inner Meadow Lagerstätte, Newfoundland, Canada | Geology | GeoScienceWorld The Ediacaran biota has been informally divided into three ecostratigraphic units: the lowermost deep marine Avalon Assemblage, the overlying

So it seems that the Kotlin Crisis and subsequent Kotlinian Dead Zone recognized by Brasier are coincident with a major turnover of the Ediacaran biotas. The first major #Extinction that the #Eumetazoa ever experienced!

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Juvenile Arcyria/Heterotrichia sp. accompanied by clausiliid snails (note their sinistrally coiled shells). Kicin, Wielkopolska (western Poland).
#slimemoulds #slimemolds #śluzowce #Eumetazoa #Amoebozoa #snails #ślimaki #Gastropoda #Metazoa