Tonian Period

Diversification of acritarchs

The Tonian is the first period of the Neoproterozoic, occuring after the Stenian (Mesoproterozoic Era) and before the Cryogenian Period

Geologic Age


What happens during this time?



Above: Palaeolyngbya, a cyanobacterium, from Bitter Springs (Schopf). 

Above: Acritarch algae

Above: Macroalgae from the Early Tonian of Yukon Territory

Above: Seaweed-like green alga, Proterocladus antiquus

Above: Vampyrella feeding on a filamentous green alga

Above: thin section from the Congolese dolomitic shale rock showing fungal hyphae (Bonneville et al. 2020)