Boulder Clay
a clay stratified or unstratified, belonging to the boulder formation.
French BOULEVARD (böl-vär), a French word formerly applied to the ramparts of a fortified town, but when these were leveled, and the whole planted with trees and laid out as promenades, the name boulevard was still retained. Modern usage applies it also to many streets, which are broad and planted with trees, although they were not originally ramparts. The most famous boulevards are those of Paris.