Ferns
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From Urantia Wiki, the encyclopedia of The Urantia Book
230 million years ago, the elevation of the continents proceeded, and the atmosphere was becoming enriched with oxygen. The earth was overspread by vast forests of ferns one hundred feet high and by peculiar trees without leaves. This was indeed the age of ferns, with luxurious vegetation covering the land. 59:4-5 60:2.7 60:4.5
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