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单词 lingula flag
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Lingula 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. 37/2Lingula 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.
extracted from lingulan.
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