The Geological Society of America

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Gigantic Ordovician volcanic ash fall in North America and Europe: Biological, tectonomagmatic, and event-stratigraphic significance
Huff,Warren D. et al.
Geology(1992),20(10):875
http://dx.doi.org/10.1130/0091-7613(1992)020<0875:GOVAFI>2.3.CO;2

The Geological Society of America
The Geological Society of America
GeoScienceWorld
GeoScienceWorld