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270 Million Years Ago

It is around this time that there is a major shift in vegetation and tectonic assembly. The supercontinent Pangaea is formed, and cone-type trees, bushes and spore-like ferns form. These replace the carboniferous forests that predate them, as the climate changes.

Pangaea with today's political map.

Everything reduces in size a little by this point, and the first marine reptiles appear. There has now been egg formation in reptiles for over 100 million years, which created a new line in species.

Cycads grow in this period of nitrogen-rich air, which cyanobacteria living in the soil help enrich it and convert the nitrogen from the air for them to use.

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