The structural and industrial materials of California (1906)
Aubury, Lewis E., b. 1862 · Sacramento, W.W. Shannon, Superintendent State printing · leaf 229
ored plastic clay that is not used,but whicii must be removed in order to get the fire clay. Overlyingthe green clay in most places is a layer of sand containing polishedgranite boulders. Despite the considerable expense of quarrying theclay at this pit, it has been removed in large quantities. The… … ^p:*^4^f^^,
Building stones · Portland cement · Clay · Mines and mineral resources
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