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Paleozoic origin of the cycads /

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Megasporophylls and associated plant parts from Upper Pennsylvanian and Lower Permian rocks of southwestern United States are interpreted as lineage of cycads, derived from pteridosperms. Cycadean foliage is thought to be derived from Paleozoic taeniopterids.

Bibliographic Details
Main Author: Mamay, Sergius H., 1920-
Corporate Author: Geological Survey (U.S.)
Format: Government Document Book
Language:English
Series:Geological Survey professional paper ; 934.
Subjects:
Cycads, Fossil.
Paleobotany > Paleozoic.
Paleobotany > Southwest, New.
Description
Summary:Megasporophylls and associated plant parts from Upper Pennsylvanian and Lower Permian rocks of southwestern United States are interpreted as lineage of cycads, derived from pteridosperms. Cycadean foliage is thought to be derived from Paleozoic taeniopterids.
Item Description:Includes index.
Physical Description:iii, 48 pages, 5 leaves of plates : maps ; 29 cm.
Bibliography:Bibliography: pages 44-46.