The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . Fig. 3.— Geography of North America late in theDevonian. Preceding this stage land areas had beenmore extensive, particularly in the eastern UnitedStates; following this stage the seas expanded tothe condition shown in the next map. GEOLOGY 1 Probokble l&ndsL , ,i Probeibic marinewaJtcrsI 1 Uixknown. Fig. 4.—? Geography of North America during theMississippian. age. At this stage the late Paleozoicseas probably had greatest extent. Again, the

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The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . Fig. 3.— Geography of North America late in theDevonian. Preceding this stage land areas had beenmore extensive, particularly in the eastern UnitedStates; following this stage the seas expanded tothe condition shown in the next map. GEOLOGY 1 Probokble l&ndsL , ,i Probeibic marinewaJtcrsI 1 Uixknown. Fig. 4.—? Geography of North America during theMississippian. age. At this stage the late Paleozoicseas probably had greatest extent. Again, there are records of tropical vegetationwithin the present Arctic Circle, and also of ageneral ice mantle extending in Europe andAmerica as far south as the fortieth parallel oflatitude. Extensive glaciers occurred in Aus-

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1908