| 单词 | bottom rock |
| 释义 | > as lemmasbottom rock bottom rock n. rock which is at or forms the bottom of something; (as a count noun) a rock at the bottom of something; figurative = rock-bottom n. 2b; Geology and Mining the stratum of rock on which a later series of deposits lies; (formerly) spec. (in plural) †those rock strata which lie below the oldest known fossiliferous rocks (obsolete).Cf. bed-rock n. ΘΚΠ society > morality > moral evil > moral or spiritual degeneration > [noun] > lowest point nadir1793 bottom rock1810 the world > the earth > structure of the earth > constituent materials > rock > [noun] > rock at low or lowest level bottom rock1810 undermass1942 1810 J. Wilson Hist. Mountains III. 749 The bottom rock, on which the first layer of compact lava rests,..is chiefly an iron ore, composed of a calx of iron and clay. 1854 R. I. Murchison Siluria ii. 21 The sediments which underlie the strata containing the lowest fossil remains constitute, in all countries which have been examined, the natural base or bottom rocks of the deposits termed Silurian. 1887 C. B. George 40 Years on Rail v. 93 About the time I had reached bottom rock in my financial troubles,..I met A. B. Pullman. 1923 O. E. Meinzer Occurr. Ground Water in U.S. 162 In many wells..these tests are not decisive and the real nature of the bottom rock must be left in some doubt. 1988 Field & Stream Mar. 42/2 Most strikes are indistinguishable from the tug that occurs when a fly bumps bottom rocks. < as lemmas |
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