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Which types of rock form the Rock of Gibraltar?

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The Rock of Gibraltar rises steeply behind a coastal city, with green-blue water in the foreground and a partly cloudy sky above. — Gibraltar The rock of Gibraltar.

The Rock of Gibraltar is primarily composed of a ridge of limestone and shale. This geological formation rises abruptly from the isthmus, featuring sheer cliffs on its eastern side and a more gradual slope on the west.1