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单词 pulley-stone
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pulley-stone
pulley-stone n. English regional (Derbyshire) Obsolete a fossil produced by the accumulation of sediment inside the stem of a crinoid, forming a cylindrical cast with successive grooves and flanges marking the joints of the stem; also called screw-stone.
ΚΠ
1800 T. King Fossils: Catal. Genuine & Entire Museum Curious Subjects Nat. Hist. John Strange 5 Pulley stone, from Derbyshire.
1843 G. Mantell Jrnl. 10 July (1940) 173 Cherts with casts of entrochi (pulley stones).
1859 D. Page Handbk. Geol. Terms 306 Pulley-stones, a familiar term for the hollow casts or moulds of the joints and stems of encrinites.
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