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The Silurian Environment

Atmospheric O2 content was about 80% that of the present, while CO2 content was probably about 17 times that of the Holocene average.

O2 continued its Paleozoic buildup.

CO2 levels were similar to those of the Ordovician.

The mean surface temperature was quite warm—about 62° F, compared with 57° F today.

Sea levels averaged about 600 feet above today’s levels, somewhat lower than in the Ordovician.

Epicontinental seas remained extensive.

Life was mostly aquatic.

However, alongside lakes and streams, there were low moss meadows inhabited by arthropods.

Silurian

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