North American species of Tempskya and their stratigraphic significance /
A description of two new species of the Early Cretaceous tree fern Tempskya and a discussion of the characters and distribution of the other North American species.
| Main Authors: | , |
|---|---|
| Format: | Government Document Book |
| Language: | English |
| Series: | Geological Survey professional paper ;
874. |
| Subjects: |
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