France. Service de la carte geologique de France North Decimal Degree 46.2414 South Decimal Degree 45.8815 East Decimal Degree 0.2618 West Decimal Degree -0.5673 Photocopy. Relief shown by hachures. Principal meridian: Paris. Longitude is given in centesimal values (100 grades = 90 degrees) .The Service de la carte geologique de la France was integrated to the BRGM to become the only France Service geologique national. Based on "Carte topograqphique de l'etat major."