Paleozoic origin of the cycads / / by Sergius H. Mamay

• Autore: Mamay Sergius H. <1920->
• Pubblicazione: Washington : , : United States Department of the Interior, Geological Survey, , 1976
• Descrizione fisica: 1 online resource (iii, 48 pages, 5 unnumbered pages of plates) : illustrations
• Soggetto topico: Cycads, Fossil; Paleobotany - Paleozoic; Paleobotany - West (U.S.); Paleobotany; Paleozoic Geologic Period
• Soggetto geografico: Southwest, New
• Note generali: 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."
• Nota di bibliografia: Includes bibliographical references (pages 44-46) and index.
• Titolo autorizzato: Paleozoic origin of the cycads
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Lingua di pubblicazione: Inglese
• Record Nr.: 9910706837103321
• Lo trovi qui: Univ. Federico II