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单词 soft burr
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soft burr
soft burr n. a sandy limestone forming a stratum of the Purbeck beds; cf. burr n.5 3.
ΚΠ
1829 Trans. Geol. Soc. 2 41 Another mass of calcareous stone,..is divided into two by a slaty bed, the upper being called aish, and the lower the soft burr.
1900 Proc. Assoc. Munic. & County Engineers 26 38 The aish is followed by a bed about 18 inches in thickness known as ‘soft burr’.
1999 E. Newby Departures & Arrivals 169 The way to these merchantable beds was through ten levels of..the Lower Purbeck Beds—Shingle, Slat, Bacon Tier, Aish (used for holystoning the wooden decks of ships), Soft Burr, Dirt Bed (which yields fossilized conifers), Top and Skull Cap.
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