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THE JOURNAL OF GEOLOGY.

examples have designedly been confined almost exclusively to North America, and while additional ones might have been given within this area, but more particularly in other countries, enough has been presented to indicate that paleobotany may be relied upon to supply a series of stratigraphic marks in every way as reliable for the cases they cover as those supplied by any of the other branches of paleontology.

F. H. Knowlton.

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