| 单词 | second bottom |
| 释义 | > as lemmassecond bottom second bottom n. (a) U.S. the first terrace above the normal flood plain of a stream; (b) Australian a second stratum of gold-bearing material found by sinking below the bottom (bottom n. 6c). ΘΚΠ the world > the earth > minerals > mineral sources > [noun] > strata containing minerals fuller's eartha1350 fulling eartha1399 fulling clay1647 second bottom1787 iron pan1811 ledge1847 blue lead1854 oil shale1866 oil sand1875 Cambridge coprolite1881 Cambridge greensand1882 gem-bed1886 the world > the earth > land > land mass > shore or bank > land near river > [noun] > flooded > above flood plain second bottom1787 1787 J. Mathews Jrnl. 23 Aug. in S. P. Hildreth Pioneer Hist. (1848) vii. 184 Went to view the Indian works, which are about a mile from the fort. They extend for about half a mile on the second bottom. 1788 Massachusetts Spy 19 June 3/2 Next to these are what is called second bottoms, which are elevated plains, and gentle risings of the richest uplands. 1855 R. Caldwell Gold Era of Victoria x. 116 As regards the question of ‘second bottoms’, which has excited considerable discussion,.. all such attempts must..end in disappointment and loss to those engaged in them. 1862 J. A. Patterson Gold Fields Victoria vii. 80 There is no known reason why there should not be a second bottom on Bendigo Flat. 1905 T. C. Chamberlin & R. D. Salisbury Geol. iii. 195 (caption) Diagram illustrating a distinct terrace and a ‘second bottom’.., which may be regarded as a low terrace. 1924 Prof. Papers U.S. Geol. Surv. No. 126. 14/1 Bluffs 30 to 50 feet in height separate the flats of the gravel-covered terraces from the second bottoms. < as lemmas |
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