| 单词 | rider seam |
| 释义 | > as lemmasrider seam b. A thin seam of coal or deposit of ore overlying a principal seam or vein. Frequently attributive, as rider seam, rider vein. ΘΚΠ the world > the earth > minerals > mineral deposits > [noun] > stratum or bed > of coal > type of coal seam foot coal1665 foot-rid1665 top coal1803 ten-yard coal1839 rider1840 ten-foot coal1855 top-hard1855 yard-coal1855 yard-seam1862 guide seam1867 main1867 bank1881 rearer1883 thick coal1883 thick seam1883 thin seam1883 1840 D. Mushet Papers Iron & Steel App. 868 Rider vein, from the Cwm Evan Bach Level, lies between the Wern Dhu and Wern Pistill, about 28 yards apart. 1873 J. Macfarlane Coal-regions Amer. 49 It is overlaid by a rider seam, often four feet thick, separated by a shale varying from one to four feet. 1907 A. Strahan Geol. S. Wales Coal-field viii. v. 44 At Tessington's Colliery..the Fiery or Wernddu Rider was worked as far west as the Great Western Railway, where a fault was struck. 1977 F. D. Davis & H. H. Doelling Coal drilling at Trail Mountain (Utah Geol. Surv.) 15/2 In drill hole 4, the Hiawatha bed has a rider seam 2 feet thick. < as lemmas |
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