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Updated: May 28, 2025
"The little stream, which failed in the night, now runs freely, the result of condensation of moisture in the atmosphere above. We start again and ascend a steep, loose trail in the manner of yesterday. The trail is very pleasant here, springs of excellent water coming out from under the cross-bedded sandstone and trees of considerable size shadowing the way. The Saddle.
These sedimentary clays are in two divisions, the upper and lower, each being about one hundred feet thick. They are separated by heavy deposits of well-rounded, cross-bedded gravels and sands, similar to those spread at the present time by the intermittent streams of arid regions. A similar record is shown in the old floors of Lake Bonneville.
At the same time the bar may be worn away at the upper end, a, and thus slowly advance down stream. While the deposit is thus cross bedded, it constitutes as a whole a stratum whose upper and lower surfaces are about horizontal. In sections of river banks one may often see a vertical succession of cross-bedded strata, each built in the way described.
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.
The summit limestone beds are pale yellow; next below these are the beautiful rose-colored cross-bedded sandstones; next there are a thousand feet of brilliant red sandstones; and below these the red wall limestones, over two thousand feet thick, rich massy red, the greatest and most influential of the series, and forming the main color-fountain. Between these are many neutral-tinted beds.
Now let the eye rest upon the objects immediately before it, and more in the center of the Canyon. The chief object is an almost detached mountain, crowned with irregular cross-bedded layers of white sandstone. This is now the name they give to Bass Camp, and the Havasupais at El Tovar, who are starting for their Canyon home, will often remark: "We go Huethawali tonight."
These deposits consist of broad, flat-lying sheets of clay and fine sand left by the overflow at time of flood, and traversed here and there by long, narrow strips of coarse, cross-bedded sands and gravels thrown down by the swifter currents of the shifting channels. Occasional beds of muck mark the sites of shallow lakelets or fresh-water swamps.
Coarse cross-bedded sandstones record the action of strong shifting currents which spread coarse waste near shore and winnowed it of finer stuff. Frequent ripple marks on the bedding planes of the strata prove that the loose sands of the sea floor were near enough to the surface to be agitated by waves and tidal currents.
The two separate walls, one above the other, on the top of the Canyon, as seen in the arms of the amphitheatre at El Tovar, are the other two wide members of this Carboniferous period. The lower is the cross-bedded sandstone, and the upper the cherty limestone.
Where fine clays are now found on the land in even, horizontal layers containing the remains of fresh-water animals and plants, uncut by channels tilled with cross-bedded gravels and sands and bordered by beach deposits of coarse waste, we may safely infer the existence of ancient lakes.
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