The prehistoric forests of the United States once included species of Ginkgo, Pseudolarix, Keteleeria, Glyptostrobus, Callitris, Eucommia, Zelkova, Pterocarya, Cercidiphyllum, Dipteronia, Koelreuteria, Cedrela, Ailanthus, Paliurus, and other genera, whose only survivors are now native to other parts of the world, particularly eastern Asia. This distribution of the fossil and living species suggests former land-bridge connections as well as adaptation to other geologic changes and accompanying climatic factors during the Cenozoic era.
Document Type: Journal Article
Geologist, U. S. Geological Survey, Washington, D. C.
Publication date: December 1, 1943
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