| Abstract: | Plant fossils from Lower Permian strata of the southwestern United States have been interpreted as cycadalean megasporophylls. They are evidently descended from spermopterid elements of the Pennsylvanian Taeniopteris complex; thus the known fossil history of the cycads is extended from the Late Triassic into the late Paleozoic. Possible implications of the Permian fossils toward evolution of the angiosperm carpel are considered. |
| Genre: | Article |
| ProdID: | 70010258 |
| Citation Author: | Mamay, S. H. |
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| Citation End Page: | 296 |
| Citation Issue: | 3877 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 2 |
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| Citation Search Results Text: | Cycads: Fossil evidence of late paleozoic origin; 1969; Article; Journal; Science; Mamay, S. H. |
| Citation Start Page: | 295 |
| Citation Volume: | 164 |
| Citation Year: | 1969 |
| Type: | citation/reference |
| Text: | Cycads: Fossil evidence of late paleozoic origin; 1969; Article; Journal; Science; Mamay, S. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1969 00:00 -0600 |
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