Ever since the Cambrian Explosion, the continent of Laurentia (what is today Eastern North America and Greenland) had been colliding with Baltica (what is today Northern Europe and the Barents Sea). They clashed over millions of years, causing volcanic eruptions, earthquakes, and the usual, creating new large bodies of land. Still, at the same time, another miniature continent was forming, which would eventually become one with the two. This tiny landmass was called Avalonia, a long island that today makes up the middle to the upper eastern coastline of the U.S. and Maritime Canada. This body