2 options
Paleozoic origin of the cycads / by Sergius H. Mamay.
Connect to full text Available online
View online- Format:
- Book
- Government document
- Author/Creator:
- Mamay, Sergius H., 1920- author.
- Series:
- Geological Survey professional paper ; 934.
- Geological Survey professional paper ; 934
- Language:
- English
- Subjects (All):
- Cycads, Fossil.
- Paleobotany--Paleozoic.
- Paleobotany.
- Paleobotany--West (U.S.).
- Paleozoic Geologic Period.
- West United States.
- Genre:
- Online resources.
- Physical Description:
- 1 online resource (iii, 48 pages, 5 unnumbered pages of plates) : illustrations.
- Distribution:
- Washington : United States Government Printing Office
- Place of Publication:
- Washington : United States Department of the Interior, Geological Survey, 1976.
- Notes:
- 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."
- Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).
- Includes bibliographical references (pages 44-46) and index.
- Other Format:
- Print version: Mamay, Sergius H., 1920-. Paleozoic origin of the cycads
- OCLC:
- 896810485
The Penn Libraries is committed to describing library materials using current, accurate, and responsible language. If you discover outdated or inaccurate language, please fill out this feedback form to report it and suggest alternative language.