| 单词 | lingula flag |
| 释义 | > as lemmasLingula flag Lingula flag n. Geology each of a series of Cambrian deposits, mainly micaceous flagstones and slates (originally in North Wales), containing abundant fossils of lingulate brachiopods; usually in plural. ΚΠ 1847 A. Sedgwick in Q. Jrnl. Geol. Soc. 3 i. 144 If we examine the Merioneth coast between Maentwrog and Barmouth, we first meet with the Lingula flags and afterwards a series of superior beds. 1893 H. Woods Elem. Palæontol. 34 Menevian Beds and Lingula Flags. 1904 H. B. Woodward Stanford's Geol. Atlas Great Brit. 86 A great expanse of Cambrian rocks stretches from the neighbourhood of Festiniog, where the slates of the Lingula flags are extensively quarried. 2006 P. J. Brenchley & P. F. Rawson Geol. Eng. & Wales (ed. 2) iii. 37/2 ‘Lingula Flags’. This name, originally used for the Maentwrog and Ffestiniog formations of North Wales, has been used for a thick comparable sequence of alternating sandstone and silty mudstone beds in South Wales. < as lemmas |
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