Avalonia

noun Av·a·lo·nia \ ˌa-və-ˈlō-nyə , -nē-ə \

Definition of Avalonia

geology
:a tectonic plate that was an independent continent about 500 million years ago and is currently divided between southwestern Great Britain and eastern North America
  • A strip of the Maine coast south of Bangor is part of Avalonia. So too is eastern Massachusetts and all of Rhode Island. … Fossil trilobites found in outcrops at Braintree, Massachusetts, are also found in the Carolinas, the Canadian Maritime Provinces, southern Ireland, and parts of England and Wales—but nowhere else on Earth.
  • —Chet Raymo and Maureen E. RaymoBoston Globe11 Dec. 1988

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Origin and Etymology of avalonia

probably back-formation from Avalonian (by analogy with other paleogeographical entities such as Laurentia), as in Avalonian orogeny, Avalonian platform, etc., from Avalon Peninsula, Newfoundland +-ian


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