释义 |
anticlinal, a. and n.|æntɪˈklaɪnəl| [f. Gr. ἀντί against + κλίν-ειν to lean, slope + -al1. Cf. Gr. ἀντικλίν-ειν to lean against (each other).] A. adj. 1. Geol. Applied to a line or axis from which strata slope down or dip in opposite directions; also said of the fold or bend in such strata, or of a ridge so formed. Opposed to synclinal.
1833Lyell Princ. Geol. III. 287 The Hastings sands, forming an anticlinal axis, on each side of which the other formations are arranged with an opposite dip. 1848Miller First Impress. viii. (1857) 134 The strata shelve downwards on both sides from the anticlinal line a-top. 1875J. W. Powell Explor. Colorado River xi. 160 Longitudinal valleys..three varieties (a) anticlinal, valleys which follow anticlinal axes. 1929H. G. Busk Earth Flexures ii. 7 An ‘anticlinal bend’ is any relatively sharp flexure in an anticlinal sense, that is, where the beds of the one limb dip gently towards the apex, and the beds of the other dip relatively steeply away from it. 2. Anat. (A vertebra) having an upright spine, towards which the spines on both sides incline.
1870Rolleston Anim. Life 12 The tenth [dorsal vertebra of the Rabbit] is the anticlinal vertebra. 3. Bot. Applied to those cell-walls at a growing-point which have a direction at right angles to the surface: opp. to periclinal a. 2. Also as n., an anticlinal wall or plane.
1882Vines tr. Sachs's Bot. 951 The planes of the walls in a growing-point are classified thus: a. Periclinal... b. Anticlinal, those which intersect the surface and the periclinal walls at right angles... If the outline..of the growing-point is a parabola..the anticlinals being the orthogonal trajectories of the periclinals, constitute a system of confocal parabolas. 1960I. F. & W. D. Henderson Dict. Sci. Terms (ed. 7) 33/2. B. n. [by ellipsis]. 1. Geol. An anticlinal fold, axis, crest, or line; a line whence strata dip in opposite directions.
1849Murchison Siluria v. 100 The same North and South anticlinal which is apparent in May Hill and Huntley Hill. 1869Phillips Vesuv. ix. 255 Anticlinals and synclinals, in the earth's crust. 2. (see A. 3.) Hence antiˈclinally adv.
1855J. Phillips Man. Geol. ii. 45 Thus in fig. 16 the strata are synclinally and anticlinally bent, but the cleavage is vertical, or nearly so. 1954New Biol. XVI. 119 In the outer layer known as the tunica the cells divide anticlinally, that is by walls at right angles to the surface. 1965G. J. Williams Econ. Geol. N.Z. xix. 349/2 The Ahaura basin at that time was but a shallow shelf or even anticlinally warped. |