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Older Pliocene volcanic Rocks. Italy. Pliocene Volcanoes of the Eifel. Trass. Having in the former part of this work referred the sedimentary strata to a long succession of geological periods, we have now to consider how far the volcanic formations can be classed in a similar chronological order.
The village of Nippes owes its origin to the trade in trass, having been founded by a Dutchman, who settled there about a century ago for the convenience of exportation. The lower part of the mass is the hardest and most compact, and is therefore preferred by the quarrymen; as it rises, the upper part becomes loose and sandy, and unfit for use.
The idea of the trass having any connexion with a deluge, is, I believe, now exploded; and geologists have agreed that it is the actual substance ejected by the volcano, subsided into a firm paste. The rain has always been observed to fall heavily after eruptions, and the water running down the sides of the hills, has formed this crust, which makes the bottom and sides of the Laach.
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