National Geologic Map Database
General Information
- Title: Ordovician - Silurian graptolites from the Ledbetter Slate, northeastern Washington State
- Author(s): Carter, Claire
- Publishing Organization: U.S. Geological Survey
- Series and Number: Bulletin 1860-B
- Larger Work: Shorter contributions to paleontology and stratigraphy
- Publication Date: 1989
- Map Scale: 1:250,000
- Cross Section: None
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