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Tornquist Sea : ウィキペディア英語版 | Tornquist Sea The Tornquist Sea or Tornquist Ocean was a sea located between the palaeocontinents Avalonia and Baltica about . The remains of the sea today form a suture stretching across northern Europe. ==Geologic evolution==
It probably formed at the same time (c. 600 Ma) as the Iapetus Ocean. Gondwana, including Avalonia until Early Ordovician, was separate from Baltica throughout the Cambrian. It probably closed during the Late Ordovician at the time of the Shelveian Orogeny of western England. There are faunal, palaeomagnetic, palaeogeographic, and apparent polar wander path evidence for the timing of closure for Eastern Avalonia (England and southern Ireland) and Baltica.〔; . Torsvik et al. 1993 proposed a "pre-Wenlock (Early Silurian) collision" but (e.g.) Torsvik & Rehnström 2003 modified the timing to Late Ordovician.〕 The Baltica-Avalonia collision also resulted in that the Rheic Ocean ceased to expand south of Avalonia around 450 Ma, in huge magmatism in Avalonia, gigantic ash fall in Baltica, and metamorphism in present-day northern Germany.
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