单词 | groove cast |
释义 | > as lemmasgroove cast groove cast n. Geology a ridge on the lower surface of a layer of sandstone corresponding to a groove on underlying mudstone. ΘΚΠ the world > the earth > structure of the earth > structural features > sedimentary formation > [noun] > stratum > position or direction of strata > load cast or sole-mark groove cast1948 load cast1953 sole mark1961 1948 R. R. Shrock Sequence in Layered Rocks iv. 163 These interesting and puzzling ridges, here designated groove casts, seem to represent sand fillings (casts) of rectilinear, V-shaped and U-shaped grooves existing in the upper few millimeters of the bottom sediment on which sand was deposited. 1963 W. C. Krumbein & L. L. Sloss Stratigr. & Sedimentation (ed. 2) iv. 130 The upper right illustration shows groove casts, elongated parallel grooves or scratches oriented in the direction of current flow. < as lemmas |
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