Killas
Chandler's Encyclopedia · 1898 · p. 38
Graywacke, paleozoic schists, intersected by the elvans and tin and copper lodes of Cornwall.
Bu kavram başka kaynaklarda da geçiyor
Chamber's Twientieth Century Dictionary (1908)
Dictionary of Science, Literature and Art (1842)
A Dictionary of Arts, Manufactures and Mines (1840)
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