clay-slaten.

An argillaceous sedimentary rock, of bluish or greenish colour, composed of indurated clay, characterized by being extremely fissile, the cleavage being entirely distinct from, and in origin subsequent to, the original stratification, which it crosses at all angles, while parallel to itself over large areas of country. In Great Britain the beds of clay-slate belong to the Cambrian and Silurian series, and supply ordinary roofing slates as well as slates for school use, and slate pencils. In other parts there are masses of clay-slate of very different ages, some supposed to be as recent as the chalk formation.

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the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > slate > argillaceous

argillite1795

clay-slate1815

1815 D. Drake Nat. & Statist. View Cincinnati ii. 65 Strata [of limestone] which alternate with layers of clay-slate.

1822 J. Woods Two Yrs.' Resid. Eng. Prairie 273 First, a vegetable mould, next loamy clay, then sand-stone, and lastly clay-slate.

1837 Penny Cycl. VII. 247/1 Clay slate.

1837 J. R. McCulloch Statist. Acct. Brit. Empire I. i. iii. 362 There is also a strip of clay-slate.

1869 E. A. Parkes Man. Pract. Hygiene (ed. 3) 19 The purest water from granitic or clay-slate districts.

1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 256 The characteristic feature of clay-slate..is that its slaty cleavage..is altogether independent of its original bedding.

1881 J. B. Jukes School Man. Geol. 325 In the Andes of South America vast masses of dark clay-slate, just like those found in our Silurian formations..having Cretaceous fossils in some parts, and in other beds fossils more like Oolitic ones.

This entry has not yet been fully updated (first published 1889; most recently modified version published online March 2018).

单词	clay-slate
释义	clay-slaten. An argillaceous sedimentary rock, of bluish or greenish colour, composed of indurated clay, characterized by being extremely fissile, the cleavage being entirely distinct from, and in origin subsequent to, the original stratification, which it crosses at all angles, while parallel to itself over large areas of country. In Great Britain the beds of clay-slate belong to the Cambrian and Silurian series, and supply ordinary roofing slates as well as slates for school use, and slate pencils. In other parts there are masses of clay-slate of very different ages, some supposed to be as recent as the chalk formation. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > slate > argillaceous argillite1795 clay-slate1815 1815 D. Drake Nat. & Statist. View Cincinnati ii. 65 Strata [of limestone] which alternate with layers of clay-slate. 1822 J. Woods Two Yrs.' Resid. Eng. Prairie 273 First, a vegetable mould, next loamy clay, then sand-stone, and lastly clay-slate. 1837 Penny Cycl. VII. 247/1 Clay slate. 1837 J. R. McCulloch Statist. Acct. Brit. Empire I. i. iii. 362 There is also a strip of clay-slate. 1869 E. A. Parkes Man. Pract. Hygiene (ed. 3) 19 The purest water from granitic or clay-slate districts. 1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 256 The characteristic feature of clay-slate..is that its slaty cleavage..is altogether independent of its original bedding. 1881 J. B. Jukes School Man. Geol. 325 In the Andes of South America vast masses of dark clay-slate, just like those found in our Silurian formations..having Cretaceous fossils in some parts, and in other beds fossils more like Oolitic ones. This entry has not yet been fully updated (first published 1889; most recently modified version published online March 2018). < n.1815
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