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出典:Wiktionary
出典:『Wiktionary』 (2015/02/04 10:30 UTC 版)
coral rag (usually uncountable, 複数形 coral rags)
出典:Wikipedia
出典:『Wikipedia』 (2010/01/01 22:03 UTC 版)
Coral rag is a rubbly limestone composed of ancient coral reef material. The term also refers to the building blocks quarried from these strata which are an important local building material in areas such as the east African coast and the Caribbean basin (e.g., Bermuda, Florida).
coral rag