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)
United States. War Department, author · Washington [D.C.] : A.O.P. Nicholson, printer · leaf 227
The geology of all this region bears the record of intense and recent volcanic action. The surface crossed before reaching the summit of the pass was covered with blocks of scoriaceous trap, pumice, trachyte, or porphyry. The prevailing rock at the highest part of our route is a friable felspathic… … lassen’s butte, from tiie north. The open space about the base of Lassen’s butte is doubtless due to the fires which, from time to time, sweep through these pine forests, yet a large area in its vicinity is overspread with volcanic products, evidently of so recent date that it seems not improbable…
Pacific railroads -- Explorations and surveys · Discoveries in geography -- American · Natural history -- West (U.S.) · Natural history -- California · Indians of North America -- West (U.S.) · West (U.S.) -- Description and travel · California -- Description and travel · United States -- Discovery and exploration
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
