| 单词 | joint-plane |
| 释义 | > as lemmasjoint-plane joint-plane n. Geology a plane in rock in which a joint exists or is liable to form; also, an exposed surface that was once such a plane. ΘΚΠ the world > the earth > structure of the earth > structural features > discontinuity or unconformity > [noun] > joint > plane jointing-plane1854 joint-plane1855 1855 J. Phillips Man. Geol. ii. 44 The cleavage and joint planes in these beds are not parallel to the general cleavage. 1895 L. Fletcher Introd. Study Rocks 51 Joint-planes are distinct from planes of fissility in that they are planes of actual discontinuity of material. 1903 Nature 24 Dec. 189/2 The caves depend for their form on the joint-planes in the massive limestone. 1905 J. Geikie Struct. & Field Geol. x. 144 Common household coal..is divided by three sets of planes disposed at right angles to each other: namely (a) planes of bedding..and (b) and (c) joint-planes. 1944 A. Holmes Princ. Physical Geol. vi. 76 The joint pattern may also control the course of rivers, the joint planes themselves commonly forming the walls of steep-sided gorges and canyons. 1970 R. J. Small Study of Landforms iv. 122 The spectacular cliffs on the east side of the A'Chir ridge coincide with near-vertical joint-planes. < as lemmas |
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