Cycads: evidence from the upper pennsylvanian
Science
.
1969 Apr 18;164(3877):294-5.
doi: 10.1126/science.164.3877.294.
Author
T N Taylor
PMID:
17812084
DOI:
10.1126/science.164.3877.294
Abstract
The fossil record of true cycads is extended from the Upper Triassic to the upper PennsYlvanian.