| 单词 | bottom-set |
| 释义 | > as lemmasbottom-set bottom-set adj. Geology designating a more or less horizontal layer of sediment formed by deposition of fine material from a river into a larger body of water at some distance from the point of inflow and beyond the fore-set deposits (cf. foreset adj. 2). ΘΚΠ the world > the earth > structure of the earth > structural features > sedimentary formation > [adjective] > of or belonging to a stratum > deposited by water > inclined bottom-set1894 foreset1905 1894 Ann. Rep. State Geologist New Jersey 1893 239 These steeply-inclined beds are superimposed upon the more level ‘bottom-set’ beds of earlier deposition. 1978 L. D. Wright in R. A. Davis Coastal Sedimentary Environments 21 Suspended sediment is deposited radially at the greatest distance from the core of constant velocity, to form horizontally bedded bottomset deposits. 2000 D. G. Batuca & J. M. Jordaan Silting & Desilting Reservoirs v. 133 Bottom-set deposits are..built-up from fine and very fine suspended sediment (silt and clay) transported by turbulent suspension and by turbidity currents when they occur, and are deposited in quiescent water. < as lemmas |
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