| 释义 |
nagelfluh Geol.|ˈnɑːgəlfluː|
Also 9 nagelflue, and with capital initial. Pl. -fluhe.
[a. G. nagelfluh, f. nagel nail n. + Swiss Ger. fluh (S. Ger. dial. flüe) rock face.]
A massive conglomerate which accompanies the molasse in the Swiss Alps and contains pebbles supposed to look like nail-heads.
1808R. Jameson Syst. Mineral. III. ix. 210 Nagelfluh.—This rock is usually composed of fragments of limestone, more or less rounded, and of various magnitudes, cemented together by a basis of calc-sinter. 1849Q. Jrnl. Geol. Soc. V. 229 If the masses of nagelflue which constitute the Rigi mountain near Lucerne, and the still loftier Speer..near Wesen be included in one group, their thickness must be enormous, certainly exceeding 6000 or 8000 feet. 1879Encycl. Brit. X. 321/2 The well-known nagelflue of Switzerland..can be shown from its fossil contents to be essentially a lacustrine formation. 1912T. G. Bonney Building of Alps i. 25 The gravels, the so-called Nagelfluhe, are occasionally fully a mile in thickness. 1962L. C. King Morphology of Earth iv. 98 The presence of conglomerates and breccias grading into arkoses shows the rapid erosion of adjacent highlands... Thus arose the coarse Nagelfluh outwash of the Alps which passes northward into finer grades of sediment. |