miogeosynclinen.
/ˌmʌɪə(ʊ)ˌdʒiːə(ʊ)ˈsɪŋklʌɪn/, U.S. /ˈˌmaɪoʊˌdʒioʊˈsɪŋklaɪn/ Geology.
A geosyncline containing little or no volcanic rock; esp. one situated between a larger, volcanic geosyncline (a eugeosyncline) and an area of the crust that has achieved stability (a craton).
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the world > the earth > structure of the earth > structural features > fold or dip > [noun] > geosyncline
geosynclinal1873
geosyncline1883
parageosyncline1923
orthogeosyncline1936
eugeosyncline1942
miogeosyncline1942
miogeocline1966
eugeocline1972
1942 Bull. Geol. Soc. Amer. 53 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.
1951 Mem. Geol. Soc. Amer. 48 4 As volcanic rocks are practically absent in the orthogeosynclines that adjoin the North American early Paleozoic craton, they are thus miogeosynclines.
1969 G. M. Bennison & A. E. 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.
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).
1990 P. Kearey & F. J. Vine Global Tectonics ix. 181 The Mesozoic-Tertiary Western Cordillera is divided longitudinally into an eastern sedimentary trough of folded clastic and carbonate rocks (‘miogeosyncline’) and a relatively undeformed volcano-sedimentary trough (‘eugeosyncline’).
This entry has been updated (OED Third Edition, March 2002; most recently modified version published online March 2022).
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n.1942