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The Tremadocian Age (485-477 Ma) occurs during the Early Ordovician Period, occurring after Stage 10 of Terreneuvian (Cambrian), and before the Floian.
Geologic Age
Geologic Age
485.4±1.9–477.7±1.4 million years ago
Eon / Era / Period / Epoch
Eon / Era / Period / Epoch
What happened during this time?
What happened during this time?
No macrofossil evidence of plant life on land
Abundant algae in the ocean, and possible algal-plant ancestors clinging to periodically drying ponds
Fossil spore-like microfossils from northern Western Australia strengthen the connection between freshwater green algae and embryophytes (Strother & Foster 2021)
Diversification of animal life
An anomalocaridid, Aegirocassis benmoulae, reaching 2m in length, was a filter feeder on plankton during this time
Most anomalocaridids were carnivorous, active hunters.
Above: Fossilized spores from Australia (Strother & Foster 2021)
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