The Marine-Life Era on Urantia · The Crustal-Shifting Stage - The Fern-Forest Carboniferous Period - The Age of Frogs

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190,000,000 years ago witnessed a westward extension of the North American Carboniferous sea over the present Rocky Mountain region, with an outlet to the Pacific Ocean through northern California. Coal continued to be laid down throughout the Americas and Europe, layer upon layer, as the coastlands rose and fell during these ages of seashore oscillations.

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