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Limestone of the Redding District, California

By. J. S. Diller.

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Excepts From

Contributions to Economic Geology - 1902, Bulletin 213
Department of the Interior, United States Geological Survey
Charles D. Walcott, Director
S. F. Emmons and C. W. Hayes, Geologists in Charge
Government Printing Office, Washington, D. C., 1903.

More limestone occurs in the copper region of Shasta County, Cal., than in an equal area of any other part of the State. A thick limestone of Triassic age occurs along the stage road east of Furnaceville, and subordinate masses crop out around the upper slope of Bear Mountain a few miles northwest of Sherman, but the principal mass of this belt forms Brock Mountain, on Squaw Creek, and may be traced for many miles to the north. This limestone is full of fossils and is especially noted for the large lizard-like animals it contains. It is generally pure, and at Brock Mountain is used for flux in the Bully Hill smelter.

A belt of more prominent limestone ridges and peaks extends from near Lilienthals north by Grey Rock, the Fishery, and Hirz Mountain, along the McCloud for many miles. The limestone where best developed is over 1,000 feet thick, and until recently has been used for flux at Bully Hill. It is cut by numerous irregular dikes of igneous rock, which locally interfere with quarrying. If the projected branch railroad up Pit River is ever built, it would pass near this great limestone.

A third belt of limestone occurs near Kennett, within a few miles of the railroad, and furnishes not only flux for the Mountain Copper Company at the Keswick smelter, but also lime, which is burned at Kennett and shipped to many points on the Southern Pacific Railroad. This limestone is of Devonian age, and consequently much older than the others. Although the limestone is not nearly as large as the others, and isolated on ridge crests by igneous rocks, it is more valuable because more accessible. Smaller masses occur near Horsetown and at several points on the plain northeast of Buckeye where lime has been burned, but since the Kennett locality has been opened they are of little importance.



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