The structural and industrial materials of California (1906)
Aubury, Lewis E., 1862- · Sacramento, W. W. Shannon, Superintendent state printing · leaf 166
t Harford, but lately thisquarry has not been used. The present quarry is in the southeastcorner of the butte, elevation 1000 feet. As yet only boulders havebeen ([uarried, the face having just reached the solid rock, whichhas a ]»orphyritic character, and breaks easily, requiring very… … H-L. No. 71. WVLIES ItHVoLlTE (iUAIiRY, SAX LUIS OIUSlO COUNTY. coping stone, curb stone, etc. It was used in the Presbyterian Church,and the basement of the Free Library, San Luis Obispo. In 1896 Mr. William Irelan made an analysis of the rock from theold (piarry, giving it silica, B4.15 per cent,…
Building stones · Portland cement · Clay · Mines and mineral resources
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