Sand, of course, is a by-product of the erosion that carved Courthouse Wash, and the floor of the canyon is filled with a thick layer of it.
(Sand; is; a by-product of the erosion) (the erosion; carved; Courthouse Wash) (the floor of the canyon; is filled; with a thick layer of it)
Sand the erosion the floor of the canyon
is carved is filled
a by-product of the erosion
Courthouse Wash
with a thick layer of it