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404:Ordovician System of Europe
231:in the United Kingdom is a
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393:Categories
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182:References
117:Ordovician
101:Hope Shale
34:Ordovician
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229:formation
50:Lithology
44:Formation
126:See also
65:Location
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109:England
80:Country
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55:Primary
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
