. Bulletin of the United States Geological Survey--Pre-Cambrian Geology of North America . like chambers; in other places it formsbasins built out into the river. Massive beds of travertine were observed on both sides of thecanyon at an elevation of 500 feet or more above the river. Thesemay have been built out from the canyon sides by springs and laterpartly eroded away, but their horizontal bedding and location onopposite sides of the canyon at about the same altitude (see sectionA, fig. 3) indicate that they are probably remnants of a mass whichformerly filled the canyon to a depth of sever
. Bulletin of the United States Geological Survey--Pre-Cambrian Geology of North America . like chambers; in other places it formsbasins built out into the river. Massive beds of travertine were observed on both sides of thecanyon at an elevation of 500 feet or more above the river. Thesemay have been built out from the canyon sides by springs and laterpartly eroded away, but their horizontal bedding and location onopposite sides of the canyon at about the same altitude (see sectionA, fig. 3) indicate that they are probably remnants of a mass whichformerly filled the canyon to a depth of several hundred feet. Theyare probably part of an extensive travertine formation having itsgreatest development near Hualpai Wash. GRAND WASH TROUGH. The Grand Wash Trough, lying between the Grand Wash Cliffs andIceberg Canyon, is a depression formed by faulting and by the tilting a Strainer is a term used locally to designate an accumulation of bowlders forming a porous damin the river, through which the water finds its way as through a strainer. U. S. GEOLOGICAL SURVE BULLETIN NO. 352 A. NORTH WALL OF CANYON IN GRAND WASH TROUGH.
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