| 单词 | red beds |
| 释义 | > as lemmasred beds red beds n. Geology any of various groups of sedimentary strata of a reddish colour; spec. (often in form Red Beds) strata composed largely of sandstone, siltstone, or shale deposited in a continental environment (esp. in the Permian and Triassic periods), and coloured red by haematite; frequently attributive (in singular or plural). ΘΚΠ the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > secondary or Mesozoic > Triassic-Jurassic red measures1803 red beds1811 Rhaetic1862 Rhaetian1883 1811 J. Farey Gen. View Agric. Derbyshire I. 157 Towards the bottom of this series, several beds of compact blue Limestone..have been discovered to differ entirely in their properties from the yellow or red beds, and to be much more proper for agricultural purposes. 1849 Q. Jrnl. Geol. Soc. 5 25 The appearance at certain points of the series of stratified deposits of red sandstones and other rocks coloured by the peroxide of iron, in regions where the older formations contain comparatively few red beds, is a fact observed in many countries. 1892 Amer. Naturalist 26 935 In the Red Bed Area, also, surface wells are abundant. 1922 Bull. Geol. Soc. Amer. 33 107 The thickest beds of such [iron] ore in the Appalachian district are in areas where the underlying red beds of Upper Ordovician age are either very thin or are entirely eroded away. 1952 W. J. Miller Introd. Hist. Geol. (ed. 6) xix. 277 The Bunter series..of Germany consists chiefly of red beds, such as sandstones and shales. 1986 L. V. Illing & A. E. Griffith in J. Brooks et al. Habitat of Palaeozoic Gas in N.W. Europe 75/2 The overlying Mercia Mudstones are a typical Keuper red-bed sequence. 2005 Oil & Gas Jrnl. (Nexis) 21 Feb. 35 Lowermost deposits include Late Triassic-Early Jurassic synrift red beds. < as lemmas |
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