Show SOME ORE DEPOSITS YOUNG newly formed veins have produced such famous mining camps campi as a goldfield and tonopah To ore depoi deposits its ranging in ago age from the time wl hen 1 en the most moat complex living thing on the earth was a crablike creature down to the time when mammals were highly developed have been found in this country among the younger deposits Is a group known to goolo gleta as the lato late tertiary veins these veins are widely distributed and are of particular interest not only because they have given rise to famous mining camps such as Tono tonopah To pali goldfield and Coni Co stoW but because owing to their comparative youth the surface on oa which they crop out Is not greatly below that choch existed at the time of their origin thus by considering tho the surface conditions and by laboratory experiments the phenomena they present can bo be interpreted moro more acau bately than those of older deposits which aro are at greater depths and are smore more deeply cut by erosion many of the lato late tort tertiary lay veins in this country all in lava rocks or closely associated with them aro are found tn in nevada |