Just to put the Chip Seal thread in perspective.

"Paris-Roubaix's Orchies sector"
http://www.cyclingnews.com/features/photos/gallery-riders-preview-paris-roubaix-course/300608

"The cobbles of Orchies are quite different from those of Arenberg"
http://www.cyclingnews.com/features/photos/gallery-riders-preview-paris-roubaix-course/300574

Yikes!  "These aren't your every day cobbles. These are Paris-Roubaix cobbles."
http://www.cyclingnews.com/features/photos/gallery-riders-preview-paris-roubaix-course/300552

"The cobbles of the Arenberg forest were recently 'cleaned'"
http://www.cyclingnews.com/features/photos/gallery-riders-preview-paris-roubaix-course/300557

"The horrible cobbles of the Arenberg forest"
http://www.cyclingnews.com/features/photos/gallery-riders-preview-paris-roubaix-course/300564

"Grass grows in between the cobbles of the Arenberg forest"
http://www.cyclingnews.com/features/photos/gallery-riders-preview-paris-roubaix-course/300560

Ben