uddenly
under one side of the boat, causing it to dip until the water poured
over the edge, holding it to that one spot in spite of every effort to
row away.

Then we would strike peaceful water again, a mile or perhaps, so quiet
that a thin covering of clear water over the top of the silt-laden
pool beneath, reflecting the tinted walls and the turquoise sky
beneath its limpid surface. Gems of sunlight sparkled on its bosom and
scintillated in the ripples left behind by the oars. When seated with
our backs to the strongest light, and when glancing along the top of
such a pool instead of into it, the mirror-like surface gave way to a
peculiar purplish tone which seemed to cover the pool, so that one
would forget it was roily water, and saw only the iridescent beauty of
a mountain stream.

The wonderful marble walls--better known to the miners as the blue
limestone walls--now rose from the water's edge to a height of eight
or nine hundred feet, the surface of its light blue-gray rock being
stained to a dark red, or a light red as the case might be, by the
iron from the sandstone walls above. There were a thousand feet of
these sandstone layers, red in all its varying hues, capped by the
four-hundred foot cross-bedded sandstone wall, breaking sheer, ranging
in tone from a soft buff to a golden yellow, with a bloom, or glow, as
though illuminated from within. As we proceeded, another layer could
be seen above this, the same limestone and with the same fossils--an
examination of the rock-slides told us--as the topmost formation at
the Grand Canyon. This was not unlike the cross-bedded sandstone in
colour, but lacked its warmth and richness of tint.

A close, examination of the rocks revealed many colours, that figured
but little in the grand colour scheme of the canyon as a whole--the
detailed ornamentation of the magnificent rock structure. A fracture
of wall would show the true colour of the rock, beneath the stain;
lime crystals studded its surface, like gems glinting in the sunlight;
beautifully tinted jasper, resembling the petrified wood found in
another part of Arizona, was embedded in the marble wall,--usually at
the point of contact with another formation,--polished by the sands of
the turbid river.

All this told us that we were coming into our own. Four of the seven
notable divisions of rock strata found in the Grand Canyon were now
represented in Marble Canyon, and soon the green shale, which
underlies the