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                Title: Gigantic Ordovician volcanic ash fall in North America and Europe; biological, tectonomagmatic, and event-stratigraphic significance
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                Author(s): Huff, W.D., Bergstrom, S.M., and Kolata, D.R.
            
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                    Publishing Organization: Geological Society of America
            
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                Series and Number: Geology v. 20 no. 10 [p. 875-878]
            
- Publication Date: 1992
- Cross Section: None
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