The main industry of Souppes in the 19th century was the quarrying of creamy white building stones for the buildings and monuments of Paris. The layer of white stone crosses the Souppes Valley from east to west, and the local stone had been used for centuries; the presence of a quarry at l'Endurcy is recorded in 1750. With the completion of the canal linking Souppes with the Seine and with Paris, providing building stone for Paris buildings and monuments became a major activity of the town. The Arc de Triomphe was built of stone from the quarry at Chateau-Landon, south of Souppes. The stone for the statue of Saint Genevieve and the Pont de la Tournelle (1928) on which it stands both came from the quarry of Souppes. All of the quarries of the valley were engaged in providing stone for the Basilica of Sacré Coeur on Montmartre at the end of the 19th and beginning of the 20th century. The quarries were a major industry until the 1950s. Two quarries are still active.