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Published online by Cambridge University Press: 01 May 2009
In a paper recently read before the Geological Society, I ventured the conclusion that the bulk at least of the “pyromerides” of the Continent would be found to be altered lavas of an originally glassy character. The careful drawings and descriptions of various petrographers formed a strong chain of evidence; and the observations of Mr. T. Davies on materials from Bouley Bay, Jersey, seemed to establish beyond a doubt the connection between rocks authoritatively styled pyromerides and those regarded in this country as ancient rhyolites. Last autumn I visited one of the most typical continental localities, the richly-wooded Tiefenbach valley west of Wuenheim in the Vosges, and a few notes on specimens then, collected may possibly be of interest to workers in a similar field.
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