Paleozoic origin of the cycads / by Sergius H. Mamay.
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.
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| Main Author: | |
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| Corporate Author: | |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington :
Dept. of the Interior, Geological Survey : for sale by the Supt. of Docs., U.S. Govt. Print. Off,
1976.
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| Series: | Geological Survey professional paper ;
934. |
| Subjects: |
Earth Sciences & Map Library - Stacks
| Call Number: |
I 19.16:934
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| I 19.16:934 | Available Place a Hold |