| 单词 | jet rock |
| 释义 | > as lemmasjet rock jet rock n. bituminous shale containing jet; esp. a bed of such shale found near Whitby, North Yorkshire. ΘΚΠ the world > the earth > minerals > types of mineral > hydrocarbon minerals > [noun] > bitumen > bituminous earth or shale ampelite1601 pitch coal1754 Kimmeridge coal1761 jet rock1798 Kupferschiefer1830 torbanite1858 the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > shale > bituminous shale Kimmeridge coal1761 jet coal1794 jet rock1798 Kupferschiefer1830 Marcellus shale1843 jet1893 1798 W. F. Mavor Brit. Tourists V. 221 Hewn out steps in the alabaster spar, or jet rock. 1875 R. Hunt & F. W. Rudler Ure's Dict. Arts (ed. 7) III. 8 The best jet is obtained from a lower bed of the upper lias formations. This bed..is known as jet rock. 1948 R. M. Pearl Pop. Gemol. vi. 245 The so-called jet rock near Whitby is a shale containing logs and irregular pieces of jet. 2000 Earth & Planetary Sci. Lett. 179 277/1 Spherical concretions 15 cm in diameter..mark the base of the Jet Rock and its top is marked by concretions 5 mm in diameter. < as lemmas |
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