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The nyssa gums are one of the modern genera of trees most certainly present among the petrified woods and forests of the Pacific Northwest. Almost every collection from the mid-Tertiary of this region contains a few specimens of typical tupelo or sour gum. These are fine-grained woods which to the unaided eye may be mistaken for conifers.
Beck, G. F. (1945). Nyssa Woods of the Pacific-Northwest Tertiary. Northwest Science, 19(1), 11-13.
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