"This area, between 35 degrees 57 minutes and 36 degrees 17
minutes north latitude, and between 111 degrees 47 minutes and 112 degrees
west longitude, is in the valley portion of the Canyon, between the mouth
of Marble Canyon and a point south of Vishnu's Temple, a little west of
where the Colorado River changes its course from south to southwest. It is
wholly within the greater depths of the Grand Canyon, east and southeast of
the Kaibab Plateau. The intercanyon valleys of this portion of the Grand
Canyon extend back from three to seven miles west of the river, and are
eroded in the crest of the Monoclinal fold that forms the eastern margin of
the Kaibab Plateau."
There are also interesting remnants of Algonkian directly opposite El Tovar
to the west of the Bright Angel Creek. They are easily discernible by their
brilliant geranium or vermilion color. They extend for a mile or more
westward, and rise above the Tonto sandstones, which properly belong above
them.
The most remarkable deposit and exhibition of Algonkian strata in the
Canyon, so far as known, occurs directly east of the great Kaibab Plateau,
opposite the Little Colorado River. Here there must be several, possibly
five or six thousand feet of these interesting strata, which Nature has
allowed to remain up to our day.
