About 400 million years ago, when the present-day continents of North America and Europe were joined, the Caledonian mountain chain was the same size as the modern Himalayas.

现在的北美大陆和欧洲大陆大约在40亿年前是连接在一起的，在那时，加勒多尼亚山脉与现代的喜马拉雅山脉一样雄伟。