One of the mysteries of the English language finally explained.
A massive conglomerate of Miocene age which is associated with the molasse of the Swiss Alps and contains pebbles likened to nail heads.
Early 19th century; earliest use found in Robert Jameson (1774–1854), geologist and natural historian. From German Nagelfluh, originally a German regional (Swiss) compound from Nagel + Fluh bare rock, rock face.
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