The Great Orme is a peninsula made mostly of limestone and dolomite, formed during the Early Carboniferous part of the Earth's geological history. Most of the Great Orme's rocks are between 339 and 326 million years old. The upper surface of the Great Orme is particularly noted for its limestone pavements covering several headland areas. There are also rich seams of dolomite-hosted copper ore. The Great Orme copper mine was estimated to have produced enough copper to make about 2,000 tons of bronze during the Bronze Age.