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i <br /> 2 1042 • <br /> SILVER CLIFF DISTRICT <br /> 'A thlcrk •sectuence of Tertiary volcanic rock: occupies a <br /> sill 'jolt ,-tectonic depression surrounded by :--ac•O.mbrian <br /> m.etairoarpbic and igneous rocks. Subsidence along ring frac- <br /> tures daring and following volcanic activity bps preserved <br /> the vo ican;a rti cks from erosion. After the eruptf t)ns' c4ftme <br /> to an end* mi nera sizing solutions emplaced s€iz I I siliver and <br /> gold ore bodies. <br /> k • <br /> Stra tigra OM and Petro logy <br /> The rdmArks on rock Classification and <br /> no aertclatur : ort aages 7 emd '8 also apply to the petrdlc�gY, of <br /> tho Silver Cliff district. The geologic r�p .of the district <br /> (plate .3) sbgt).s tfZat Or,1 r rocks of ftecamb,rlan, 'TarL•iary, <br /> 4 <br /> and Q�tat rnar,� age are ,exposed. <br /> Succession <br /> Cross (1.39£) dial Aot differentilate any'u;iits 9.n t1he <br /> -9 <br />