B. This terrace higher up the valley expands considerably; seaward it is
soon lost, its escarpment being united with that of C: it is not developed
at all on the south side of the valley.

C. This terrace, like the last, is considerably expanded higher up the
valley. These two terraces apparently correspond with B and C of Figure 9.

D is not well developed in the line of this section; but seaward it expands
into a plain: it is not present on the south side of the valley; but it is
met with, as stated under the former section, a little south of the town.

E is well developed on the south side, but absent on the north side of the
valley: though not continuously united with E of Figure 9, it apparently
corresponds with it.

F. This is the surface-plain, and is continuously united with that which
stretches like a fringe along the coast. In ascending the valley it
gradually becomes narrower, and is at last, at the distance of about ten
miles from the sea, reduced to a row of flat-topped patches on the sides of
the mountains. None of the lower terraces extend so far up the valley.)

We come now to the terraces on the opposite sides of the east and west
valley of Coquimbo: the section in Figure 10 is taken in a north and south
line across the valley at a point about three miles from the sea. The
valley measured from the edges of the escarpments of the upper plain FF is
about a mile in width; but from the bases of the bounding mountains it is
from three to four miles wide. The terraces marked with an interrogative do
not exist on that side of the valley, but are introduced merely to render
the diagram more intelligible.