| 单词 | trap-down |
| 释义 | > as lemmastrap-down A ‘fault’ in a seam of coal, also in a mineral vein or in any stratum; an up-throw or down-throw of the stratum (usually trap-up or trap-down). (Cf. step-fault n. at step n.1 Compounds 1 applied to a series of faults in the same direction.) ΘΚΠ the world > the earth > structure of the earth > structural features > discontinuity or unconformity > [noun] > fault trouble1672 dislocation1695 trap1719 trapping1758 slip1789 step1789 fault1796 throw1796 jump1842 nigger1886 1719 J. Strachey in Philos. Trans. 1717–19 (Royal Soc.) 30 971 As..they are dug near the same Depth, it follows there must be a Trap, or several Traps down, which in all must amount to that Depth between the said Works. 1883 W. S. Gresley Gloss. Terms Coal Mining Trap-down [in Bristol Coal-field], a fault which is a down-throw one... Trap-up, a fault which is an up-throw one. < as lemmas |
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