The Marine-Life Era on Urantia · The Crustal-Shifting Stage - The Fern-Forest Carboniferous Period - The Age of Frogs
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The deposits of this early Carboniferous age are from 500 to 2,000 feet thick, consisting of sandstone, shale, and limestone. The oldest strata yield the fossils of both land and marine animals and plants, along with much gravel and basin sediments. Little workable coal is found in these older strata. These depositions throughout Europe are very similar to those laid down over North America.