Mean atmospheric O2
Geologic Time Scale
Cordaites & Araucaria sunset
A forest of gymnosperms of the genus Cordaites and evergreen coniferous trees of the genus Araucaria silhouetted against a colorful sunset during the Late (Lopingian) Permian/Early Triassic period about 250 million years ago. The Cordaites were soon to become extinct while the Araucaria live on to this day.
Copyright © Walter B. Myers. All rights reserved.
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