To the north, its early strata match those of the bed of the English Channel and south-eastern England. Other boundaries lie on ridges in more recent deposits and scarps (escarpments). These include the Côte d'Or in the south-east (on an Alpine fault line) and, at a north end, the Hills of () Artois which overlie the margin of London-Brabant Massif. Oil Fields Two notable oil fields are the Chaunoy Field, the other is the Villeperdue Field. They are centred at about 1850 metre depth. See also Geologic time scale List of fossil sites (with link directory) References Anon. Carte Géologique de la France à l'Échelle du Millionième Paleozoic France Geography of France Sedimentary basins of Europe