Oroxenia caledoniana: Diferenzas entre revisións

=== Fase Escandiana/Grampiana ===

{{see also|Western Gneiss Region}}

The main phase of the Caledonian orogeny (from about 425 to 400 million years ago) is called the Scandian phase in Scandinavia and the ''Grampian phase'' in [[Great Britain|Britain]].<ref name=Jones2003>Jones & Blake (2003), pp. 47–50</ref> It was caused by the collision between [[Laurentia]] and [[Baltica]]. The Iapetus Ocean first closed in the north, then in the south. Therefore, the collision between Baltica and Laurentia took place a little earlier than that between Avalonia and Laurentia. Continental collision started in the Mid [[Silurian]] and mountain building took place in the Early [[Devonian]] (from 420–405 million years ago).<ref>Fossen & Dunlap. 1998</ref><ref>Torsvik ''et al.'' (1996)</ref> In [[North America]], the collision between Avalonia and Laurentia is called the [[Acadian orogeny]].