Rhaetic Transgression
In the early Jurassic, the Rhaetic sea flooded much of the Permian plain. On the margin of the London-Brabant Island, the estuarine conditions which left the Lower Estuarine Series prevailed for a while before the sea rose so as to deposit the Lincolnshire limestones before falling again so that the Upper Estuarine Series was left. Again the sea rose to deposit the Blisworth Limestone, the Blisworth Clay and the Upper Jurassic clays.
The same general pattern occurred in France leaving the Paris Basin flooded from Anjou to Luxembourg.
Read more about this topic: London-Brabant Massif