Question

define the caledonian period,hercynian period and the alpine period...
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Answer 1

It was caused by the closure of the Iapetus Ocean when the continents and lands of Laurentia, Baltica and Avalonia collided. The Caledonian orogeny is named after Caledonia, the Latin name for Scotland. The name is not used for an absolute period of time

Answer 2

Answer:

The Caledonian orogeny encompasses events that occurred from the Ordovician to Early Devonian, roughly 490–390 million years ago (Ma). It was caused by the closure of the Iapetus Ocean when the continents and terranes of Laurentia, Baltica and Avalonia collided.