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For many years there has been uncertainty concerning the generic status of some fossil leaves belonging without question to the walnut family as a whole. A review of the woods of Juglandaceae as they have appeared in Tertiary horizons of the western states has suggested which genera are present, and in what proportions their leaves (or other remains) might be expected to appear.
Beck, G. F. (1944). Status of Tertiary Woods of the Western States Representing the Juglandaceae. Northwest Science, 18(1), 10.
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This article was originally published in Northwest Science.