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Columbretes Islands
The Columbretes Islands (, ) are a group of small uninhabited islets of volcanic origin, in the Mediterranean Sea, off Oropesa del Mar. Administratively they belong to Castelló de la Plana municipality, Valencian Community, Spain.
The main islets are ''Illa Grossa'' ((スペイン語:Columbrete Grande)), ''La Ferrera'', ''La Foradada'' and ''El Carallot''. The total emerged area of all four is around and the highest point is above sea level. Illa Grossa, by far the largest, is the northernmost island of the group. It stands in the place of an ancient crater and shows a distinctive semi-circular pattern. There are no buildings on it, except for a 19th-century lighthouse, a jetty and the staff quarters used by the biologists working in the wildlife reserve.
==Geology==
The cone forming the Columbrete Grande was constructed during four volcanic episodes from 1.0 to 0.3 million years ago.〔Aparicio, A., Mitjavila, J.M., Arafia, V., Villa. I.M.
(1991) BoL Geol. Min., 102, 562-70〕 It consists of alkaline magmatism associated with the opening (rifting) of the Valencia Trough. Volcanism in other areas of the Valencia Trough coast dates between 10 milion years and the present and they show a transition from calc-alkaline to alkaline signature.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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