 In the Cretaceous, Laurasia split into the continents of North America and Eurasia.The Laurentian craton became a part of North America while Baltica became a part of Eurasia, and Avalonia was split between the two.Ledringhem lies on the London-Brabant Massif, a structural high or massif that stretches from the Rhineland in western Germany across northern Belgium (in the province of Brabant) and the North Sea to the sites of East Anglia and the middle Thames in southern England.