eugeosynclinal, a. Geol.
(ˌjuːdʒiːəʊsɪŋˈklaɪnəl)
[ad. G. eugeosynklinal (H. Stille Einführung in den Bau Amerikas (1941) i. 15): cf. eu-, geosynclinal a.]
Of or pertaining to a eugeosyncline.
| 1942 Bull. Geol. Soc. Amer. LIII. 1644 The great thrusting in the Virginian–Pushmataha belt may be limited to the area in which it lies on eugeosynclinal facies. 1969 Bennison & Wright Geol. Hist. Brit. Isles iv. 72 The Welsh Caledonian or Lower Palaeozoic Geosyncline..has something in common with the theoretical eugeosynclinal concept. 1977 A. Hallam Planet Earth 196/1 The scale and intensity of deformation may have been such as to force slices of the eugeosynclinal facies along shallow-dipping thrust planes into the miogeosynclinal or even the kratonic regions. 1984 D. L. Dineley Aspects Stratigr. Syst.: Devonian ix. 163/1 Eugeosynclinal rocks of Devonian age are widespread and include thick black shales, limestone lenses, thick cherts and greywackes, some conglomeratic spreads and enormously thick andesitic and basaltic volcanics. |
Also eugeoˈsyncline n., a geosyncline in which material of volcanic origin predominates.
| 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. 1969 Bennison & Wright Geol. Hist. Brit. Isles iv. 71 The standard type of geosyncline, or Eugeosyncline, typically includes sediments which are chiefly dark shales and greywackes. 1980 Nature 29 May 289/1 The western, volcanosedimentary ‘eugeosyncline’ of the North American Cordillera is a collage of terrains of varied origins that apparently became attached to the western continental margin of the continent at different times. |