Six charts showing biostratigraphic zones, and correlations based on conodonts from the Devonian and Mississippian rocks of the Upper Mississippi Valley /
| Main Author: | |
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| Format: | Book |
| Language: | English |
| Published: |
Urbana,
[publisher not identified] ;
1962.
|
| Series: | Circular (Illinois State Geological Survey) ;
328. |
| Subjects: |
| Item Description: | Cover title. Addendum and errata on slip inserted. |
|---|---|
| Physical Description: | 32 pages : illustrations |
| Bibliography: | Bibliography: pages 28-32. |