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单词 ballstone
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ballstone
ballstone n. Geology and Mining (in the English west midlands) a rounded lump of ironstone or limestone; rock consisting of such lumps.
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the world > the earth > structure of the earth > constituent materials > stone > a stone > [noun] > other stones
loys1295
anthracites1535
rockstone?1545
stone-glass1585
milkstone1598
fieldstone1649
pebble1669
ballstone1726
grain-stone1756
knablick1757
found stone1800
sitfast1809
graptolite1838
bumble1839
hardhead1849
chock1894
chockstone1894
1726 J. Laurence New Syst. Agric. i. 177 The Iron-stone and Coal..lie here together [sc. at Mear Heath, Staffordshire]; the Stone above the Coal,..having the Bass above and below it; in which they meet an Iron Oar call'd Ball Stones distinct from the Vein.
1799 R. Townson Tracts & Observ. Nat. Hist. & Physiol. 168 (table) Ball Stone [is a] grey coloured ironstone in nodules, in dry clay. These nodules contain fern leaves and other vegetable impressions.
1840 Trans. Geol. Soc. 5 412 The masses which constitute the strata frequently form large, irregularly-rounded blocks, highly crystalline and pure. They are termed ‘ballstones’, and form an excellent flux for the ironstone.
1914 Proc. Geologists' Assoc. 25 193 In an evenly-bedded limestone an irregular ball-shaped or lenticular mass of unstratified limestone is found to occur, which a closer inspection reveals to be crowded with fossils. This development of the limestone has received from the Shropshire quarrymen the name of ballstone.
1993 J. Alfrey & C. Clark Landscape of Industry iii. 34 The uppermost band of Wenlock Limestone is good-quality stone, and contains many of the prized ‘ballstones’ or ‘crog balls’—residual lumps of pure coral which create a very high-quality stone.
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