miogeosynclinal, a. Geol.
(ˌmaɪəʊdʒiːəʊsɪnˈklaɪnəl)
[ad. G. miogeosynklinal (H. Stille Einführung in den Bau Amerikas (1940) i. 15), f. Gr. µείων less: see geosynclinal a. and n.]
Of or pertaining to a miogeosyncline. So miogeoˈsyncline, a geosyncline in which the process of sedimentation appears to have been accompanied by little or no volcanism; esp. one situated between a larger, volcanic geosyncline (a eugeosyncline) and an area of the crust that has achieved stability (a craton).
| 1942 Bull. Geol. Soc. Amer. LIII. 1642 In contrast to the Magog eugeosyncline, the Champlain belt contains dominant carbonates of shallow-water origin, unaffected by subsequent volcanism; it is a miogeosyncline. Ibid. 1643 The eastern, miogeosynclinal belt has the well-described sequence of southeastern Idaho. 1951 Mem. Geol. Soc. Amer. XLVIII. 4 As volcanic rocks are practically absent in the orthogeosynclines that adjoin the North American early Paleozoic craton, they are thus miogeosynclines. 1969 Bennison & Wright Geol. Hist. Brit. Isles iii. 58 No vulcanicity is known and the succession is probably indicative of deposition on an unstable shelf at the margin of a miogeosyncline. 1971 Nature 24 Sept. 252/1 The West Andean geosyncline was divided into a ‘eugeosynclinal’ volcanic (coastal range) zone and a ‘miogeosynclinal’ sedimentary (longitudinal valley) zone during the Jurassic. 1972 Sci. Amer. Mar. 30/2 When one examines the structure of ancient folded mountains, one finds that the classic geosyncline is divided into a couplet: two adjacent and parallel structures consisting of a eugeosyncline (true geosyncline) and a miogeosyncline (lesser geosyncline), often shortened to eugeocline and miogeocline. |