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Record Nr. |
UNINA9910706837103321 |
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Autore |
Mamay Sergius H. <1920-> |
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Titolo |
Paleozoic origin of the cycads / / by Sergius H. Mamay |
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Pubbl/distr/stampa |
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Washington : , : United States Department of the Interior, Geological Survey, , 1976 |
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Descrizione fisica |
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1 online resource (iii, 48 pages, 5 unnumbered pages of plates) : illustrations |
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Collana |
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Geological Survey professional paper ; ; 934 |
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Soggetti |
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Cycads, Fossil |
Paleobotany - Paleozoic |
Paleobotany - West (U.S.) |
Paleobotany |
Paleozoic Geologic Period |
Southwest, New |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Title from title screen (viewed October 6, 2014). |
"Megasporophylls and associated plant parts from the Upper Pennsylvanian and Lower Permian rocks of the southwestern United States are interpreted as a lineage of cycads, derived from the pteridosperms. Cycadean foliage is thought to be derived from Paleozoic taeniopterids." |
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Nota di bibliografia |
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Includes bibliographical references (pages 44-46) and index. |
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