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a-particles a-rays accumulation actinium actinium series actino-uranium alteration amount Analyst Arendal atomic weight average basaltic biotite Boltwood broggerite Bull calculated Cambrian carnotite Cenozoic cent Ceylon Chem cleveite common lead correlation corresponding Cretaceous Crystallization Dana denudation deposits Devonian disintegration Earth Ellsworth estimate Euxenite evidence feet fergusonite formation galena Geol geological age gram granites helium helium ratios Holmes igneous rocks ionization isotopes Joachimsthal Joly Joly's Katanga Kirsch later lead ratios limestone Lower mass material Mesozoic metamict meteorites method Middle Pre-Cambrian million Mineralogy monazite Norway number of atoms ocean Ontario original Paleozoic pegmatites period Phil pitchblende pleochroic halos Pre-Cambrian present probably Proc radioactive minerals radium range rare-earth ring Rutherford samarskite sandstone sediments shale sodium specimen Strutt Table Tertiary thickness thorianite thorite thorium thorium-lead tion Upper Pre-Cambrian uranate uraninite uranium uranium and thorium uranium minerals weight of lead Ytterby zircon