Avalonia

Avalonia was a microcontinent that existed approximately 500 million years ago. Today, its remnants are divided between southwestern Great Britain and eastern North America, including parts of New England such as eastern Massachusetts and all of Rhode Island. Fossil evidence, like trilobites found in Braintree, Massachusetts, indicates connections to regions in the Carolinas, Canadian Maritime Provinces, Ireland, and England. The name "Avalonia" likely derives from the Avalon Peninsula in Newfoundland. The Avalonian orogeny, a mountain-building event, is associated with this microcontinent and impacted areas like Newfoundland, the Canadian Maritime Provinces, and New England during the late Precambrian era.12