File:Collier's new encyclopedia - a loose-leaf and self-revising reference work with 515 illustrations and ninety-six maps (1921) (14804072533).jpg

Identifier: colliersnewencyc01newy (find matches)
Title: Collier's new encyclopedia : a loose-leaf and self-revising reference work ... with 515 illustrations and ninety-six maps
Year: 1921 (1920s)
Authors:
Subjects: Encyclopedias and dictionaries
Publisher: New York : P. F. Collier
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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ands, some with perpendicularsides more than 1,000 feet high. No partof the world has so rich a field of archseo-logical and ethnological investigation asArizona. Long-buried dwellings and cit-ies, with other ruins of an exceedinglyancient people, are being continually dis-closed. Geology.—The weird canons are re-markable in that they exhibit all the geo-logical formations of North America.Geologists declare that the Coloradoriver, in its whole course, has cutthrough strata representing a thicknessof 25,000 feet, and exposed the grada-tions from the quarternary alluvial de-posits through volcanic alterations to theprimary azoic rocks. The Grand Caiionof the Colorado alone shows upper car-boniferous limestone, cross-stratifiedsandstone, red calcareous sandstone withgypsum, lower carboniferous limestone,shales, grits, Potsdam sandstone andgranite and other formations. Mineral Production.—Arizona is oneof the most important of the mineralproducing States. Its most important rl li \ L
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ARIZONA 251 ARIZONA mineral products are copper, gold, sil-ver, and lead. It also has valuable de-posits of zinc, coal, iiickel, graphite,tungsten, and other metals. The copperproduction has increased steadily in re-cent years. The smelter output in 1918was 769,522,729 pounds, compared with719,034,514 pounds in 1917. In the pro-duction of copper, Arizona far exceedsany other State. The gold productionin 1918 was 278,647 fine ounces, valuedat $5y760,200; the silver production was6,771,490 fine ounces, valued at $6,771,-490. The zinc production exceeds invalue $2,000,000 annually. The value ofthe lead produced is also in excess of$2,000,000. Gold production in 1919 wasvalued at $5,716,200. The total valueof the mineral products of the State in1917 was $212,615,978. Soil.—Of the total area, embracing over72,500,000 acres, only a comparativelysmall portion, approximating 5,000,000acres, is arable land, and of this partabout 500,000 acres are under irrigationand highly productive. The co

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