LIMESTONE OF THE REDDING DISTRICT, CALIFORNIA. 
By J. S. Diller. 
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 lime- 
stone 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 b} r Grey Rock, the Fishery, and Hirz Moun- 
tain, 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 igne- 
ous 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 Rail- 
road. 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 Horse- 
town and at several points on the plain no: oheast of Buckeye where 
lime has been burned, but since the Kennett locality has been opened 
they are of little importance. 
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