| 释义 | Jura Geol.
(ˈdʒʊərə, ‖ ʒyra)
[Name of the range of mountains on the borders of France and Switzerland that gave its name to the Jurassic system; in this use prob. a. Ger. Jura, Jura- Jurassic (n. and adj.).]
Jurassic rocks or strata; the Jurassic system. Also attrib., = Jurassic a.
Jura-trias = Triassic; lower or black Jura = lias 2; middle or brown Jura = dogger3 2; upper or white Jura = malm n. 1 a.
1829Proc. Geol. Soc. I. 94 On the descent to Sospello [near Nice] are found, in a regular descending series, green-sand, Jura, oolitic (or younger Alpine) limestone, lias, red-marl, and older Alpine limestone or dolomite. 1851Q. Jrnl. Geol. Soc. VII. ii. 42 (heading) On the comparison of the German Jura formation with those of France and England. Ibid. 46 In the Jura, or in the lower land of Berne, where the ‘black Jura’ is developed, there is no great extension in width. Ibid. 47 The Marne, Seine,..Indre, &c., all of which flow westward, descend from the Lias to the ‘brown Jura’, and thence to the ‘white’; whilst in the German ‘Jura’ the rivers flow from the heights of the ‘white Jura’ through the ‘brown’ and the ‘black’. Ibid. 85 The ‘Jura’-formations in northern Asia. 1893P. Lake tr. E. Kayer's Text Bk. Compar. Geol. 241 In England the Jura forms a broad zone striking N.N.E. 1895Jrnl. Geol. III. 380 During all this time the Upper Jura of South America..retained its central European character. 1900Jrnl. Geol. VIII. 216 The rocks of the region represent..remnants of formations belonging to the Algonkian, Cambrian, Silurian, Carboniferous, Juratrias, Cretaceous, and Eocene periods. 1929Bull. Geol. Soc. Amer. XL. 176 (heading) Delimitation of Jura and Trias in British Columbia. 1955G. G. Woodford tr. M. Gignoux's Stratigr. Geol. vii. 314 In describing the Swabian Jura, Quenstedt and Leopold von Buch distinguished three successive groups of rocks, to which they gave the names Black Jura, Brown Jura, and White Jura, in accordance with their appearance in outcrops. These three groups correspond approximately to what we now call the Lower Jurassic or Lias, the Middle Jurassic or Dogger and the Upper Jurassic or Malm. |
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