"Pena Blanca," composed of tertiary limestone. These are
the result of a seismic upheaval running from north to south, almost at
right angles with the main axis of the chains that form the mountainous
vertebrae of the island.

Between the city of Pinar del Rio and the north coast of La Esperanza,
the Organos are broken up into four or five parallel ridges, two of
which are composed of limestone, while the others are of slate,
sandstones and schists. The term "magote," in Cuba, is applied to one of
the most interesting and strikingly beautiful mountain formations in the
world. They are evidently remnants of high ranges running usually from
east to west, and have resulted from the upheaval of tertiary strata
that dates back probably to the Jurassic period.

The soft white material of this limestone, through countless eons of
time, has been hammered by tropical rains that gradually washed away the
surface and carved their once ragged peaks into peculiar, round,
dome-shaped elevations that often rise perpendicularly to a height of
1,000 feet or more above the level grass plains that form their base.
Meanwhile the continual seepage of water formed great caverns within,
that sooner or later caved in and fell, hastening thus the gradual
leveling to which all mountains are doomed as long as the world is
supplied with air and water. The softening and continual crumbling away
of the rock have formed a rich soil on which grows a wonderful wealth of
tropical vegetation, unlike anything known to other sections of Cuba, or
perhaps to the world.

The valley of the Vinales, lying between the city of Pinar del Rio and
the north coast, might well be called the garden of the "magotes," since
not only is it surrounded by their precipitous walls, but several of
them, detached from the main chain, rise abruptly from the floor of the
valley, converting it into one of the most strangely beautiful spots in
the world.

John D. Henderson, the naturalist, in speaking of this region, says:
"The valley of the Vinales must not be compared with the Yosemite or
Grand Canyon, or some famed Alpine passage, for it cannot display the
astounding contrast of these, or of many well-known valleys among the
higher mountains of the world. We were all of us traveled men who viewed
this panorama, but all agreed that never before had we gazed on so
charming a sight. There are recesses among the Rocky Mountains of Canada
into which one gazes with awe and bated b