200 million years ago
Mean atmospheric O2
130% of modern level
Mean atmospheric CO2
7x pre-industrial level
3°C above modern level
Geologic Time Scale
Early Jurassic Earth
This is how the
western hemisphere of the Earth may have appeared 200 million years ago
during the Early Jurassic period. North is at the top.
During this period continental drift, driven by the massive forces of plate
tectonics, had just begun to break the supercontinent of Pangea into
Laurasia in the north and Gondwana in the south.
In this image the nascent North American continent has just broken away from
North Africa while South America and the rest of Africa remain joined as
Gondwana. To the west in the global Panthalassa ocean are strips of land
corresponding to the Wrangellia Terrane which later merged with western
© Walter B. Myers. All rights reserved.
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