- Additional Authors
- Geological Survey (U.S.), issuing body.
- Description
- 1 online resource (iii, 48 pages, 5 unnumbered pages of plates) : illustrations.
- Series Statement
- Geological Survey professional paper ; 934
- Uniform Title
- Geological Survey professional paper ; 934.
- Subject
- Note
- 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."
- Bibliography (note)
- Includes bibliographical references (pages 44-46) and index.
- Call Number
- GPO Internet I 19.16:934
- OCLC
- marcive896810485
- Author
Mamay, Sergius H., 1920- author.
- Title
Paleozoic origin of the cycads / by Sergius H. Mamay.
- Publisher
Washington : United States Department of the Interior, Geological Survey, 1976.
- Type of Content
text
- Type of Medium
computer
- Type of Carrier
online resource
- Series
Geological Survey professional paper ; 934
Geological Survey professional paper ; 934.
- Bibliography
Includes bibliographical references (pages 44-46) and index.
- Connect to:
- Chronological Term
From 230 to 570 million years ago
- Added Author
Geological Survey (U.S.), issuing body.
- Other Form:
Print version: Mamay, Sergius H., 1920-. Paleozoic origin of the cycads (DLC) 76014384 (OCoLC)2283844
- Gpo Item No.
0624 (online)
- Sudoc No.
I 19.16:934