Juran.
/ˈdʒʊərə/, /ˈʒʊərə/, U.S. /ˈdʒurə/ Geology.
Jurassic rocks or strata; the Jurassic system. Also attributive, = Jurassic adj. and n. Jura-trias = Triassic adj.; lower or black Jura = lias n. 2; middle or brown Jura = dogger n.3 2b; upper or white Jura = malm n. 1(a).
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the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > secondary or Mesozoic > Jurassic
Jura1829
Jurassic1831
1829 Proc. Geol. Soc. 1 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.
1851 Q. Jrnl. Geol. Soc. 7 ii. 42 (heading) On the comparison of the German Jura formation with those of France and England.
1851 Q. Jrnl. Geol. Soc. 7 ii. 46 In the Jura, or in the lower land of Berne, where the ‘black Jura’ is developed, there is no great extension in width.
1851 Q. Jrnl. Geol. Soc. 7 ii. 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’.
1851 Q. Jrnl. Geol. Soc. 7 ii. 85 The ‘Jura’-formations in northern Asia.
1859 D. Page Handbk. Geol. Terms s.v. Jurassic Continental geologists are in the habit of dividing the Jurassic formation into three groups—viz., the ‘White (or Upper) Jura’, ‘Brown (or Middle) Jura’, and ‘Black (or Lower) Jura’.
1885 A. Geikie Text-bk. Geol. (ed. 2) 804 The German Lower or Black Jura presents many points of resemblance to the English Lias.
1885 A. Geikie Text-bk. Geol. (ed. 2) 804 The Dogger or Brown Jura represents the Lower Oolite of England.
1885 C. Lyell Man. Elem. Geol. (ed. 4) 311 The Malm, or white Jura..consists of white limestone and marls.
1893 P. Lake tr. E. Kayser Text Bk. Compar. Geol. 241 In England the Jura forms a broad zone striking N.N.E.
1895 Jrnl. Geol. (Chicago) 3 380 During all this time the Upper Jura of South America..retained its central European character.
1900 Jrnl. Geol. (Chicago) 8 216 The rocks of the region represent..remnants of formations belonging to the Algonkian, Cambrian, Silurian, Carboniferous, Juratrias, Cretaceous, and Eocene periods.
1929 Bull. Geol. Soc. Amer. 40 176 (heading) Delimitation of Jura and Trias in British Columbia.
1955 G. G. Woodford tr. M. Gignoux 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.
This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2022).
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