| 单词 | ripple drift |
| 释义 | > as lemmasripple drift ripple drift n. Geology (the appearance of) crosswise structure in a system of ripple marks on sedimentary rock, providing an indication of prevailing currents or flows at the time of deposition.Quot. 1859 is from a paper read at a meeting held on 15 April 1852. ΚΠ 1852 H. C. Sorby in Proc. Geol. & Polytechnic Soc. West-Riding Yorkshire 15 Apr. (1859) 232 The particles of sand are drifted forward, and thrown down in layers on that side of the ripples towards which the current moves. This structure is what I call ‘ripple drifted’.] 1856 H. C. Sorby in Edinb. New Philos. Jrnl. 3 114 The direction of a current can also be ascertained from the ripple marks; from that modification of them for which I have proposed the term ‘ripple drift’. 1859 H. C. Sorby in Proc. Geol. & Polytechnic Soc. West-Riding Yorks. 3 232 The particles of sand are drifted forward, and thrown down in layers on that side of the ripples towards which the current moves. This structure is what I call ‘ripple drifted’.] 1972 G. D. Johnson & C. F. Vondra in A. G. Jhingran et al. Himalayan Geol. II. 126 (caption) Cross-stratified sandstones are symbolized by their dominant form (ripple-drift, planar, trough). 2002 G. M. Ashley in J. Menzies Mod. & Past Glacial Environments xi. 354/1 Density underflows carrying turbid mixtures of sand, silt and clay frequently deposit climbing ripple-drift sequences. < as lemmas |
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