| 单词 | cap rock |
| 释义 | > as lemmascap rock cap rock n. Geology an overlying rock or stratum; see also quot. 1956. ΘΚΠ the world > the earth > structure of the earth > structural features > rock formations > [noun] > dome or cap cap rock1867 dome1900 louderback1930 1867 O. J. Hollister Mines of Colorado 64 The quartz and cap or wall-rock. 1874 R. W. Raymond Statistics Mines & Mining i. 317 The barren, or ‘cap rock’, now met with at the water-line in that mine. 1956 J. C. Swayne Conc. Gloss. Geogr. Terms 30 Cap-rock, (a) a stratum of resistant rock covering another of less resistant material; (b) the rock cover over the top of a salt-plug; (c) unproductive rock covering valuable ore. 1958 New Scientist 30 Jan. 8/3 If there exists suitable limestone or sandstone to form a reservoir rock, with an impervious ‘cap-rock’ layer above it, all the conditions for an oil field will be present. < as lemmas |
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