File:Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean (1855) (14737974506).jpg

Identifier: reportsofexplora03unit_0 (find matches)
Title: Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean
Year: 1855 (1850s)
Authors: United States. War Dept Henry, Joseph, 1797-1878 Baird, Spencer Fullerton, 1823-1887 United States. Army. Corps of Engineers
Subjects: Pacific railroads Discoveries in geography Natural history Indians of North America
Publisher: Washington : A.O.P. Nicholson, printer (etc.)
Contributing Library: San Francisco Public Library
Digitizing Sponsor: California State Library Califa/LSTA Grant

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, (No. 65,) and is described in Chapter X. It is this sandstone which isregarded as Triassic, and which Mr. Marcou, in his notes, thought was the same as that form-ing the Antelope hills. (See September 18.) Tucumcari Hill.—On descending from the Llano to the valley of Rocky Delaware creek, thered-colored strata were again encountered, and the trail passed upon them, with occasionalexceptions, as far as Hurrah creek, a tributary of the Pecos. The bluffs of the Llano were con-stantly in view on the south. Beyond Camp 48, the mound called Tucumcari is found, rising tothe height of the Llano, but standing apart from it, and completely isolated. This is calledCerro Tucumcari by Captain Marcy,2 who remarks that it is round and symmetrical, and whenseen at a distance, resembles the dome of the capitol at Washington. Simpson also remarks -■-Shumard in Marcys Report, pp. 191, 192. 9 This name appears to have been given to the mound by Gregg. See his work entitled Commerce of the Prairies.
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PYRAMID MOUNTAIN CRETACEOUS FOSSILS. 25 this resemblance, and we are indebted to him for the first observations upon the extent and ele-vation of the hill. Its circumference at the base was found to be nearly six miles, its height about700 feet, and the area of the summit about 230 by 370 yards.1 I do not find any description ofthe strata of this mound in the notes of Mr. Marcou, but I do not doubt, from the statements ofLieutenant Whipple, that they agree exactly with those of the Llano. This is also indicated bythe fact that the slopes of the mound are covered with cedars, exactly as on the northern slopesof the Llano. We have also the section of Pyramid mountain, by Mr. Marcou, which is notfar distant, and may be regarded as an exhibition of the mineral character of the Tucumcari andof the Llano. Pyramid Mountain.—The finest and most complete section of the horizontal strata of thebluffs along the route was obtained at this mountain by Mr. Marcou. The point was pecu-liarly favora

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