Grotto Spring, Grand Cañon, Colorado River. The water flows from the rocks above and the umbrella-shaped rock about it is tufa, that has been formed by deposition from the mineral constituents of the water. The light spot seen through and beyond is the sand-beach of the river. Looking through this Grotto is seen in the distance the walls of the Grand Cañon, 3,500 feet in height on either side.
Title from item.
Part of series: War Department, Corps of Engineers, U.S.A. Geographical Explorations and Surveys West of the 100th Meridian.
Part of series: Expedition of 1871. 1st. Lieut. Geo. M. Wheeler, Corps of Engineers, Commanding.
Number on item: No. 4
Number on item: 136
Notes (date):
Dates from similar item held at Boston Public Library.
This date is inferred.